Analysis of Flow through Vaneless Contra-Rotating Turbine of Jet Propulsion Engine

As per the increasing demand of Jet propulsion Engine, it is required to improve the efficiency, reduction of weight and consideration of fuel consumption, which lead the researchers to arrive at an unconventional turbine known as vaneless contra rotating turbine (VCRT). The major advantage of this is in its compactness or in its ability to give high power/total weight. Research in this area is being pursued since many years. Scientists are putting their best to get the aim to its zenith. Such placement of flow path elements gives benefits, but needs special approach to organize flow inside the turbine. Modern aerodynamic designs, computational and optimization methodologies allow us to fulfill this task in the shortest period of time with the highest gain in turbine performance. The Aim of this topic is to understand the significance of blade design, geometries & domains and its effect in turbine efficiency & performance at various operating conditions. In this paper, three-dimensional multiblade row Navier-Stokes (3D RANS) simulations have been performed to investigate the flow characteristics of a VCRT. Bladegen modular are used to generate the Blades. TurboGrid modular is used for meshing. The turbine components are modeled for all the three spacing. In present work, 3D viscous flow simulation with SST k-? turbulence model is carried out in ANSYS CFX14.5. The flow in VCRT is very complex including several flow phenomena, such as turbulence, separation, swirling flow and unsteadiness flow. The variation of flow parameters from hub to tip of blades are presented in graphical form and average circumferential area (ACA) value of cascade parameters from inlet to outlet of the blades are computed at different operating regimes. The results of this analysis shows a good prediction of the flow behavior inside the blades and this lead to acceptable blade design, which can be used in VCRT

Volumetric, viscometric and optical study of molecular interactions in binary mixtures of diethyl malonate with ketones at 303.15, 308.15 and 313.15K

Density ρ, viscosity η, and refractive index nD were measured for the binary mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone, cyclohexanone and 3-pentanone) at temperatures (303.15, 308.15 and 313.15) K over the entire composition range. Excess volume VE, deviation in viscosity Δη, excess Gibb’s free energy of activation for viscous flow ΔGE and deviation in molar refraction ÄR were determined from the experimental data and computed results were fitted to the Redlich-Kister polynomial equation. The values of VE, Δη, ΔGE, and ΔR were plotted against the mole fraction of diethyl malonate. The observed positive and negative values of excess parameters for all the studied binary mixtures were explained on the basis of intermolecular interactions present in these mixtures. Further different empirical relations were used to correlate the binary mixture viscosities and refractive indices

Comparative analysis of maternal and fetal outcome in meconium stained amniotic fluid and clear liquor in primigravida

Background: The present study was undertaken to evaluate the significance of MSAF and its fetal outcome in parturients.Methods: A total of 121 pregnant women who had completed more than 37 weeks of gestation with live singleton pregnancy, spontaneous onset of labor and at term with adequate pelvis were included in the study. All (121) low risk primigravida with MSAF were studied to identify maternal and fetal outcome and compared with equal number of cases with clear amniotic fluid. Meconium stained cases were clinically classified into two groups- thin (54 cases) and thick (67 cases). MSAF on spontaneous or artificial rupture of membranes were monitored with fetal heart rate abnormality, 1- and 5-minutes Apgar score, NICU admissions and neonatal complications as outcome variables.Results: Overall incidence of meconium staining of AF during labour was 7.71%. The common fetal heart rate abnormalities i.e. bradycardia was seen in 36% in MSG. Apgar score of less than 7 was observed in MSG at 5 minutes in 5% of cases, in thick group. Major neonatal complication was birth asphyxia in MSG (18.18%) that was more in thick MSG (14.87%). MAS were observed in 6 cases in thick and 4 cases in thin meconium stained cases. NICU care was required in 18% cases in MSG and in control group it was required in 7% cases. Neonatal morbidity was more in newborn with thick meconium group (52%) compared to thin meconium group (20%).Conclusions: The present study confirmed that meconium staining of amniotic fluid adversely influences the fetal outcome

Isolation, Characterization and Purification of α-Galactosidase From Peas

In India, the peas are cultivated on a large scale. The α-galactosidase enzyme has principle applications in food industries and in the medical field. The α-galactosidase enzyme was purified from dry peas (Pisum sativum). The purification steps include acetone precipitation and DEAE-cellulose column chromatography. The enzyme has maximum activity at 40°C and optimum pH=7.5. The molecular weight of the enzyme was determined by using SDS-PAGE analysis and found to be 110 kDa. The purified enzyme was immobilized by sodium alginate and it was observed that the immobilized enzyme showed an increase in thermal tolerance

Vibration Analysis of Silencer Based on FEM and FFT Analyser

Silencer was considered with and without modifying in order to reduce the vibration. Design and modeling have been done with specifying different material properties. Finite Element Method was used for the modeling and simulations. The harmonic analysis has been performed by using ANSYS 18.0. The natural frequency and working frequency are the very important parameters to study the resonance. It is mandatory to avoid this resonating condition. These frequencies are distinguished with the help of ANSYS 18.0

Role of diagnostic hysteroscopy in evaluating patients with abnormal uterine bleeding in a tertiary care centre

Background: Abnormal uterine bleeding is one of the commonest conditions amongst patients attending gynaecology OPD which also leads to significant disruption in a normal lifestyle. The causes of abnormal uterine bleeding are heterogeneous and complex. A systematic evaluation with detailed history and physical examination is foremost important in reaching diagnosis. Hysteroscopy is not only safe, quick and observes entire uterine cavity but also helps in precision in sampling and increases accuracy of diagnosis. It is also curative in conditions such as polyps, fibroids, uterine synechiae, menorrhagia and lost intrauterine contraceptive device. The aim of the study is to evaluate the role of hysteroscopy as a screening method in patients with AUB & compare to their USG findings and to the histopathological reports of the endometrial biopsy.Methods: This is a prospective observational study conducted at a tertiary healthcare centre over a period of 18 months, in 50 females belonging to pre, peri and post-menopausal age group. Sampling was done based on selection criteria after obtaining valid consent from the study group.Results: Hysteroscopy has a definitive role in evaluation of patients presenting with abnormal uterine bleeding with high sensitivity, specificity, PPV and NPV with immediate results.Conclusions: The above study concludes that the accuracy of diagnosing the cause of abnormal uterine bleeding is more with hysteroscopy followed by D and C then USG combined with D and C