Complete flow conditioning gauzes

This paper presents a novel method that can completely condition the flow into a turbomachinery experiment. A single, thick, 3D-printed gauze can be tailored to provide an exact stagnation pressure profile, flow angle distribution and turbulence intensity. The new method is superior to existing techniques as it provides accurate and cheap flow conditioning in just one component. It removes the requirement for separate endwall boundary layer generators, inlet guide vanes and turbulence grids.Rolls-Royce plc. Aerospace Technology Institut

Separated Flow Topology in Compressors

Abstract When a multistage high-speed compressor is operated away from its design point, extreme incidence is caused in some blade rows. This results in large, localized separations that are three dimensional in nature. In this paper, topological reasoning is used to describe the behavior of these three-dimensional separations. It is shown that two classes of separation exist: one in which the flow progresses from attached to separate in a smooth way and another where there is a discontinuity in the response of the flow topology. It is shown that the global structure of the flow depends on the type of topological response that occurs. When the response is discontinuous, nonaxisymmetric cells of separated blades are formed. When the response is smooth, the resultant separated flow is axisymmetric. The paper is split into two broad sections: The first section presents examples of the two different classes of topological response that can occur in a single blade row, and it also shows how an engineer can achieve a different response by altering the blade design. The second section covers the analysis of a multistage high-speed compressor. The compressor initially presents the discontinuous behavior with rotating cells of separations. It is then redesigned to reduce the severity of the cell behavior or remove it entirely.</jats:p

Student Research Projects With Industrial Impact

Abstract This paper describes six final year undergraduate research projects supported by a collaboration between the Whittle Laboratory at the University of Cambridge and Reaction Engines (RE), a UK aerospace company. The collaboration is now in its fourth year of projects relating to RE's synergetic air breathing rocket engine (SABRE). The approach taken in these projects combines modern teaching pedagogy with a best practice methodology for industrial-academic collaboration and a well established framework for structuring research problems. This paper explains how the three methodologies are tailored and adapted for use with final year undergraduate research projects. The approach is mapped on to an annual project cycle which begins with the industry and academic partners deciding which topics to investigate and proceeds through student selection, the project work itself and concludes with student assessment and end-of-year reporting. The projects combine analytical, computational and experimental work and have covered counter-rotating turbomachinery, S-ducts in compressors and Helium Turbine design, all of which are topics of primary importance to the design of SABRE. Following descriptions of each of the six completed projects, the impact of the work and lessons learned are considered from the point of view of the students, the industrial partner and the academic supervisors. Overall, the students found the work extremely engaging and have all been encouraged to pursue careers in engineering, either in industry or through postgraduate study. For the industry partner the collaboration provides expertise and an approach which is not available in-house as well providing a “second look” at key technical questions. For the academics involved, the opportunity to lead research on a “real” problem with an industrial partner has proved highly motivating as well as providing opportunities for personal and career development.The student projects were funded by Reaction Engine

Super aggressive s-ducts for air breathing rocket engines

Abstract Air breathing rocket engines require turbomachinery and ducting that is substantially lighter than that used in ground based or aerospace gas turbines. In order to reduce the weight of the axial compressor, the design of the inter-spool swan neck duct is targeted. In this paper a circumferential splitter blade is used to reduce loading and diffusion on the duct endwalls. The splitter and duct geometry are coupled and optimised together using 2D CFD. A design is selected that is 30% shorter than ducts that are currently used in aerospace gas turbines and the 3D flow features are investigated in further detail using an experimental rig and 3D CFD. This paper shows that the “splittered” duct has 3 benefits over a conventional duct design: First, separation of the endwalls is prevented even at short duct lengths, this will reduce distortion into the downstream compressor. Second, losses generated by corner separations on structural struts can be reduced by 20%, enabling short ducts to achieve high performance. Third, splittered ducts are shown to be twice as robust to uncertain inlet flow conditions as conventional ducts. This allows a designer to target high performance short designs with reduced risk.</jats:p

Young people, partner abuse and sexual health: indicators of increased risk

Partner abuse (PA) is common among young people, but is often missed by professionals working in health, social care, education and the criminal justice system. This paper explores the types of PA experienced by young people and links with sexual health to see whether there are factors which indicate greater vulnerability to abuse. Young people aged 16 to 20 from across the UK (n=1,754) completed an online survey in 2010‐11. We report experience of emotional, physical and sexual partner abuse and model the associations with demographic and sexual health variables in bivariate analysis using logistic regression. A third of participants reported one or more types of PA within the previous three months, regardless of gender of partner. PA was significantly associated with sexually transmitted infection (Odds Ratios 1.6 and 2.9 for young women and young men respectively), regretted sex (OR 2.7 and 1.9), distress or worry about sex life (OR 2.7 and 4.6), sexual problems, numbers of sexual partners (OR 1.2 for each additional partner), and sexual health service use (for young men) (OR=1.9). These ‘indicators’ may be noticed by professionals who work with young people, and can act as prompts to ask about partner abuse

Competing three-dimensional mechanisms in compressor flows

Three-dimensional design is central to all modern compressor design systems, but many of these methods still rely on a two-dimensional and sectional view of aerodynamics at their core. This paper argues that this view fundamentally limits design by not considering the effect, on separation and loss, of the pressure gradient on the surface of the blade perpendicular to the meridional direction, here known as the transverse pressure gradient. The first part of the paper details how altering the transverse pressure gradient, by changing a blade's 3D stacking, switches the way in which the blade aerodynamically "fails," from a open corner separation to a trailing edge separation. It also shows how the transverse pressure gradient significantly changes the blade profile loss. In the second part, the effect of the transverse pressure gradient on the uncertainty inherent in the compressor design space is investigated. It is shown that as blade pitch-chord ratio is raised and the amount of 3D stacking is lowered, the uncertainty of predicting a compressor's operating range is significantly raised. By increasing 3D stacking and the strength of the transverse pressure gradient, it is shown that this uncertainty can be significantly reduced.The authors would like to thank Rolls-Royce plc for their contributions and permission to publish this work, Chris Hall, Ian Bousfield, Simon Gallimore and Nicholas Cumpsty for their invaluable advice, the EPSRC for their support, TURBOSTREAM for the use of their solver, and Graham Pullan for his comments on 3D thinking

Predicting the operability of damaged compressors using machine learning

Abstract The application of machine learning to aerospace problems faces a particular challenge. For successful learning a large amount of good quality training data is required, typically tens of thousands of cases. However, due to the time and cost of experimental aerospace testing, this data is scarce. This paper shows that successful learning is possible with two novel techniques: The first technique is rapid testing. Over the last five years the Whittle Laboratory has developed a capability where rebuild and test times of a compressor stage now take 15 minutes instead of weeks. The second technique is to base machine learning on physical parameters, derived from engineering wisdom developed in industry over many decades. The method is applied to the important industry problem of predicting the effect of blade damage on compressor operability. The current approach has high uncertainty, it is based on human judgement and correlation of a handful of experimental test cases. It is shown using 100 training cases and 25 test cases that the new method is able to predict the operability of damaged compressor stages with an accuracy of 2% in a 95% confidence interval; far better than is possible by even the most experienced compressor designers. Use of the method is also shown to generate new physical understanding, previously unknown by any of the experts involved in this work. Using this method in the future offers an exciting opportunity to generate understanding of previously intractable problems in aerospace.Aerospace Technology Institute Rolls-Royce plc

TINJAUAN KRIMINOLOGIS TERHADAP TINDAK PIDANA INCEST DENGAN KORBAN ANAK(STUDI KASUS DI LAPAS KLAS IIA BANDA ACEH)

ABSTRAKTRI KARUNIA PUTRI AMELIA,TINJAUAN KRIMINOLOGIS TERHADAP 2015 TINDAK PIDANA INCEST DENGAN KORBAN ANAK (STUDI KASUS DI LAPAS KLAS IIA BANDA ACEH)Fakultas Hukum Universitas Syiah Kuala(v,54),pp.,bibl(Dr. DAHLAN ALI., S.H., M.Hum., M.Kn.,)Salah satu kejahatan yang sering terjadi adalah tindak pidana perkosaan. Tindak pidana perkosaan merupakan salah satu dari tindak pidana terhadap kesusilaan. Dalam Bab XIV dalam Buku II KUHP memuat kejahatan terhadap kesusilaan yang tersebar pada pasal 281 hingga 303 KUHP. Di dalamnya yang dimaksud dengan kesusilaan sebagian besar berkaitan dengan seksualitas. Salah satu jenis kelainan seksual adalah hubungan seks yang dilakukan secara paksa bersama seseorang yang masih ada hubungan darah yaitu incest, dan yang biasanya menjadi korban ialah anak-anak. Incest sebagaimana dirumuskan dalam kamus besar bahasa Indonesia adalah hubungan seksual antara orang-orang yang bersaudara dekat yang dianggap melanggar adat, hukum dan agama. Sanksi mengenai incest dengan korban anak dapat dilihat dalam Pasal 81 dan Pasal 82 Undang-Undang No. 23 Tahun 2002 Tentang Perlindungan Anak.Penelitian ini bertujuan untuk menjelaskan faktor penyebab terjadinya tindak pidana incest, dan untuk mengetahui upaya yang perlu dilakukan untuk menanggulangi tindak pidana incest di provinsi Aceh.Untuk memperoleh data dalam penelitian skripsi ini, dilakukan penelitian pustaka (library research) dan penelitian lapangan (field research) yang dilaksanakan di Banda Aceh dengan lokasi penelitian pada Lembaga Pemasyarakatan Klas IIA dengan tipe penelitian deskriptif yaitu menganalisis data yang diperoleh dari studi lapangan dan kepustakaan dengan cara menjelaskan dan menggambarkan kenyataan objek. Hasil penelitian menunjukkan bahwa faktor-faktor penyebab terjadinya tindak pidana incest adalah: Faktor rendahnya pendidikan dan ekonomi, Faktor lingkungan atau tempat tinggal, Faktor alkohol, Faktor kurangnya pemahaman terhadap agama, dan Peranan korban. Penanggulangan tindak pidana incest dapat dilakukan dengan cara mengadakan pelayanan emergency call kepada masyarakat, mengadakan pengedukasian bagi para orang tua, dan juga pembinaan mental kepada pelaku dan korban tindak pidana incest.Disarankan kepada pemerintah agar hendaknya memperbanyak wadah tempat pengaduan untuk masyarakat, serta diadakan penyuluhan hukum agar dapat menumbuhkan kesadaran masyarakat untuk benar-benar mentaati hukum. Selain itu disarankan agar sistem pembuktian dalam kasus perkosaan dapat lebih permudah, khususnya incest.Banda Ace

Perspectives of people in Mali toward genetically-modified mosquitoes for malaria control

Background: Genetically-modified (GM) mosquitoes have been proposed as part of an integrated vector control strategy for malaria control. Public acceptance is essential prior to field trials, particularly since mosquitoes are a vector of human disease and genetically modified organisms (GMOs) face strong scepticism in developed and developing nations. Despite this, in sub-Saharan Africa, where the GM mosquito effort is primarily directed, very little data is available on perspectives to GMOs. Here, results are presented of a qualitative survey of public attitudes to GM mosquitoes for malaria control in rural and urban areas of Mali, West Africa between the months of October 2008 and June 2009. Methods: The sample consisted of 80 individuals - 30 living in rural communities, 30 living in urban suburbs of Bamako, and 20 Western-trained and traditional health professionals working in Bamako and Bandiagara. Questions were asked about the cause of malaria, heredity and selective breeding. This led to questions about genetic alterations, and acceptable conditions for a release of pest-resistant GM corn and malaria-refractory GM mosquitoes. Finally, participants were asked about the decision-making process in their community. Interviews were transcribed and responses were categorized according to general themes. Results: Most participants cited mosquitoes as one of several causes of malaria. The concept of the gene was not widely understood; however selective breeding was understood, allowing limited communication of the concept of genetic modification. Participants were open to a release of pest-resistant GM corn, often wanting to conduct a trial themselves. The concept of a trial was reapplied to GM mosquitoes, although less frequently. Participants wanted to see evidence that GM mosquitoes can reduce malaria prevalence without negative consequences for human health and the environment. For several participants, a mosquito control programme was preferred; however a transgenic release that satisfied certain requirements was usually acceptable. Conclusions: Although there were some dissenters, the majority of participants were pragmatic towards a release of GM mosquitoes. An array of social and cultural issues associated with malaria, mosquitoes and genetic engineering became apparent. If these can be successfully addressed, then social acceptance among the populations surveyed seems promising

The core Planar Cell Polarity gene, Vangl2, maintains apical-basal organisation of the corneal epithelium

This work was performed under Biotechnology and Biological Sciences Research Council (BBSRC) research grant BB/J015237/1 to JMC. DAP was funded by an Anatomical Society PhD Studentship whose support is gratefully acknowledged. ASF was funded by a BBSRC DTG PhD Studentship. We thank staff at the Medical Research Facility and Aberdeen Microscopy Services for technical assistance.Peer reviewedPostprin