National Aerospace Laboratories Institutional Repository

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    Component Drawings for Compact By-Pass Engine

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    Future military applications of small Gas Turbine Engine will require compact,lightweight engines delivering high specific thrust with low specific fuel consumption.It is also required that these engines should run over a wide operating range of Flight Mach Number and Altitudes. As a first phase of the project a design optimization study has been carried out a t Propulsion Division, National Aerospace Laboratories,Bangalore under sponsored project "Optimization of Compact by-pass engine - Preliminary Design" for the indigenous development engine for unmanned aerial vehicle by DRDO.The work has been extended as a second phase to generate preliminary component drawings for optimized engine cycle.For this the aerodynamic parameters and overall dimensions for the components were generated for the optimized engine cycle.From the generated aerodynamic parameters preliminary assembly,sub assembly and component drawings were prepared using AUTO CAD.This report describes the work done in the second phase of the project

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    Design and Testing of Wing Leading Edge of a Light Transport Aircraft

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    The design of wing leading edges are primarily based on certification requirements as defined by the regulatory for bird strikes. A typical wing leading edge comprises of skin, rib and baffle plate. The idea of a baffle plate is that it will prevent the bird from impacting the spar, in case of penetration of the skin. The selection of right materials, configuration and fasteners play an important role in containing the damage due to bird strike. The selection of the skin thickness was done based on the RAE empirical formula and through limited bird strike tests on plain leading edge specimens. The role of baffle and selection of its thickness were based on bird strike FE analysis. The selection of fasteners was done based on a rivet pull through tests on an aluminum plate. The selection of rib spacing was based on a parametric study through bird strike FE analysis. The design, analysis and fabrication of leading edge specimens was carried out at NAL and the bird impact tests were conducted at the Gas Turbine Research Establishment, Bangalore. An optimum design configuration of the leading edge is arrived through these studies which meets the regulatory requirements

    Experimental studies on a liquid fuelled medium scaled valved pulsejet

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    A pulsejet is a simple propulsive device where the combustion occurs in pulses and the propulsive effort is achieved from the reaction to the rearward flow of hot gases. Pulsejets offer a compelling alternative for small scale propulsion requirements. In this work a valved pulsejet configuration popularly known as dynajet was investigated using different fuels and thermal barrier coatings for the valves to assess its performance and improve its durability. Successful sustained pulsations were obtained with three liquid fuels namely petrol, methanol and a mixture of methanol and nitro methane. The effort included measurement of thrust, fuel consumption and temperature. The effect of using a zirconia based thermal barrier coatings on the valves to improve the valve life was also investigated. It was observed that among the fuels investigated petrol gave the best specific impulse and further the thermal barrier coatings had a negligible impact on extending the valve life

    Proceedings of Two Day Ukieri Workshop on Unmanned Aircraft Systems Technologies

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    A two day workshop on „Unmanned Aircraft Systems Technologies. was organized by the Multi Sensor Data Fusion group, Flight Mechanics and Control Division (FMCD) at Hotel Matthan, HAL Airport Road on 8th and 9th December 2011. The fourth UKIERI (UK - India Education and Research Initiative) workshop was hosted by NAL, one of the four Indian partners of a major award project funded by the UK and Indian governments. The UKIERI program was started in April 2006 with the aim of enhancing educational links between India and the UK. In the year 2007, the group of institutions consisting of CSIR-NAL Bangalore, Indian Institute of Science (IISc) Bangalore, Indian Institute of Technology (IIT) Bombay, National Institute of Technology (NIT) Trichy on the Indian side and the University of Leicester, Leicester, UK were among the first six to win a major award under this programme for their joint proposal entitled "Towards Reliable and smart Air vehicles". In his welcome address at the inaugural session, Mr. Shyam Chetty, Officiating Director,NAL acknowledged the immense contribution made by Prof Ian Postlethwaite towards the UKIERI project. He mentioned that the final workshop organised by NAL is aimed at sharing the progress of the project and providing a platform to share expertise and knowledge in research, development and technologies in the vibrant and exciting area of autonomous unmanned air vehicles (UAVs) in India and UK. He reiterated that the partnerships which have been forged between the two countries should be nurtured further to make it stronger. Dr (Mrs) Girija Gopalratnam, Deputy Head, FMCD in her inaugural address described the work carried out at FMCD, NAL on application of Artificial Intelligence techniques for fault tolerant control. Enhanced Synthetic Vision System for ground operator situation awareness and system identification for UAV flight data were additional technologies that were included and pursued under the UKIERI project. She mentioned that the activities described in the original work plan have been followed closely with each partner taking a lead in certain tasks. The progress has been discussed and presented at three workshops held earlier at IISc, NITT and IIT Bombay. Prof Ian Postelthwaite, Deputy Vice Chancellor, Northumbria University, UK in his inaugural remarks described the work carried out by each of the five partners. The IISc team, led by Prof Sitarama Bhat has made contributions in three main areas, namely, the design and construction of an instrumented light-weight long-endurance mini UAV capable of autonomous trajectory planning in cluttered environments, design of control laws for the automatic landing of UAVs and coordination problems in multi-vehicle systems. The IIT Bombay team led by Professor Bandyopadhyay has worked on sliding mode control for UAVs using fast output sampling. The NITT team led by Prof Ramakalyan has developed UAV path planning algorithms working closely with research staff at IISc. The Leicester research activities of Professors Postlethwaite, Gu and Edwards have been aimed at increasing the levels of autonomy that can be achieved in UAVs using methods and algorithms for flight path planning, mission planning and task assignment for single and multi-vehicle systems. A common theme in all of the above has been the need for real-time implementation in the presence of uncertainties arising from unpredictable operating environments. Lt. Gen (Dr.) V.J. Sundaram, PVSM, AVSM, VSM (Retd.) Advisor, Micro and Nano Systems, National Design and Research Forum who has spearheaded the Unmanned Aircraft programs in India was the keynote speaker. In his keynote address, which was titled, MICRO / NANO / BIO AIR VEHICLES – INDIA, Gen Sundaram covered in detail the developments in India and the research areas that need to be pursued for future developments. The Research areas include low Reynolds number aerodynamics, light weight composite structures, robust control with vision and GPS based navigation and guidance and light weight propulsion. The National Design and Research Forum jointly supported by AR&DB and the Department of Science and Technology, supports R&D in micro and nano air vehicles based on fixed, rotary and flapping wings with special focus on insect flight aerodynamics / mechanics, Cooperative flying, Robust swarm control, Vision based navigation and guidance as well as appropriate sensors. The Two day workshop had four invited talks and twelve paper presentations by the team members from the five organizations. In the concluding session, all the partners expressed that the UKIERI program has established strong relationship between UK and India. Though the current project is over, the research work and the cooperation will continue. The program brought institutions in India to work together and enabled a number of students to pursue and finish their PhD degrees. It was felt that Government funding for future collaborative projects could be explored. In this Special Publication, the summary of the invited talks and the extended abstracts of the papers along with the presentation material are compiled
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