Liquid Propulsion System Center, Indian Space Research Organization (ISRO) Department of Space (Trivandrum, INDIA)
PROFESSIONAL EXPERIENCE [Since Oct-2007]
Working in the Propulsion Research & Studies Group at ISRO. The focus of my job is to provide the engineering solutions to troubleshoot problems in the Flow and Thermal area for development of liquid & cryogenic rocket stages, engines and facilities with the help of thermal and CFD simulation.
MAJOR PROJECTS AT THE LIQUID PROPULSION SYSTEMS CENTER
Performed two-phase CFD analysis of tank draining to determine liquid interface motion and ullage pressure-temperature evolution using Volume of Fluid technique including mass transfer mechanism.
Developed a conjugate CFD model for simultaneous operation of clustered 800 N thrusters for detailed study of under expanded plume behavior, plume impingement, interaction including gas radiation using Discrete Ordinate Methodology. The complex phenomenon of multiple plume interactions, shear layer development, plume radiation and flow reversal was well captured.
Three dimensional flow and thermal analysis of Air heater unit for scramjet propulsion test facility. CFD modeling for different configurations of secondary air injection was performed to determine uniformity in mixture composition and temperature at heater module outlet.
Performed transient simulation of rocket engine start up and shut down in vacuum, in order to determine safe mode of operation for high altitude test facility.
Performed detailed two phase analysis (both Lagrangian & Eulerian dispersed phase treatment) to design water cooled deflector pit for rocket engine testing in ground. Carried out experiments for concept verification & CFD code validation at sub-scale level for plume impingement on inclined plate with multiple water orifices.
Completed CFD simulation of transcritical methane flow in rocket engine regenerative channels and combustion modeling of single element pre-burner injector to understand flow/flame field and combustion characteristics at supercritical conditions.
Performed multi-phase, multi-species simulation for spray cooing of combustion gas with water liquid to predict thermal profile over gas generator walls for thermostructural analysis. Complex two phase physics and mass transfer phenomenon modeled in eulerian framework.
Developed a transient CFD model to determine GN2 pressure and temperature evolution in LH2 tank to further validate with the flight data.
Carried out three dimensional conjugate CFD analysis to simulate hot test of twin nozzle configuration liquid rocket stage to determine the nozzle wall temperature due to entrainment and surface radiation effects.
Performed transient CFD analysis of Gaseous helium bottle placed in Liquid hydrogen tank of cryogenic rocket stage to determine the gas bottle charging sequence.
Carried out detailed flow field analysis of steering engine nozzle with closure to determine the separation load on the dual snap off connectors during flight. 2
Developed a radiation model of Rotary Vacuum Brazing Facility for determining the uniformity of hardware temperature of cryogenic engine nozzle divergent. Accomplished thermal environment prediction of cryogenic rocket pyro valve elements.
Detailed thermal analysis was carried out to predict temperature at pyro valve initiator assemblies.
Completed detailed transient flow and thermal analysis of steering engine with nozzle closure to determine the time at which nylon ring melts and closure detaches from nozzle divergent. Detailed thermal analysis for booster turbo pump considering pump side coolant, turbine side hot gas and bearing heat generation rate performed to determine thermal conditions at critical locations of liquid hydrogen booster turbo pump.
Combined experimental, numerical and optical investigation (M-Z interferometry) of heat transfer characteristics in grooved channels. Three dimensional CFD Analysis of the Vortex combustion chamber to determine flow field flow characteristics and to establish unconventional method of cooling and combustion in a Rocket engine.
Performed a CFD simulation of the gaseous film cooling through compounded injection orifices. Parametric study was carried out to determine optimum compounded injection on gaseous film cooling effectiveness and film cooling length.
Experimental investigation to determine heat transfer enhancements in Alumina/water nano-fluid in laminar flow regime. Numerical modeling to investigate convective heat transfer and flow features of alumina/water and alumina/kerosene nano-fluids with variable particle loadings. A single phase constant property model was developed to determine change in heat transfer coefficients.
ACADEMIC RESEARCH EXPERIENCE [July, 12- July, 14]
Completed M.Tech programme in Thermal and Fluid Engineering specialization at Mechanical Engineering Department of Indian Institute of Technology Bombay, Mumbai and earned A+ grade in thesis work titled ‘Optical and Numerical Investigation of Temperature fields and Study of Heat Transfer Enhancement in Horizontal grooved/ribbed Channels’. [Dec, 06-May, 07]
Completed six months in Indian Institute of Technology, Delhi doing Master of Science in the Fluid and Thermal sciences Department and completed first Semester with CGPA of 8.81/10.00. Carried out flame speed computations for different gaseous mixture compositions using Chemkin software
EDUCATION M-Tech in Mechanical Engineering [July,12- July,14] Indian Institute of Technology Bombay (Score: 8.46/10 CGPA)
B-Tech in Mechanical Engineering [Aug,02-Jun,06] Punjab Technical University (Jalandhar, Punjab) (Score: 81%, equivalent to 4.0/4.0 GPA) 3
SOFTWARE SKILLS ANSYS-FLUENT, CFX, CFD++, CFDCRUNCH, GAMBIT, I-DEAS-TMG, C TESTS & SCORES -
Graduate Record Examination (GRE General Test): 1270/1600 -
Test of English as Foreign Language (TOEFL iBT): 86/120
ACADEMIC COURSE WORK - Basic & advanced Thermodynamics - Basic & advanced Fluid Mechanics - Computational Fluid Dynamics - Convective Heat and Mass Transfer - Gas Dynamics - Refrigeration & air conditioning - Engineering Mathematics - Conduction and Radiation - Heat Exchangers - Combustion - Analysis of I.C Engines
HIGHLIGHTS - Academic Excellence Award in B-Tech (First Position in the College). - Qualified in Graduate Aptitude Test in Engineering (GATE-2007) - Executive member of Astronautical Society of India –Student’s Chapter. - Regional Coordinator World Space Week Association.
REFERENCES 1. Prof. Atul Srivastava, Indian Institute of Technology Bombay, Powai Email: atulsr(at)iitb.ac.in, 2. Dr. N.K Gupta, Vikram Sarabhai Professor Liquid Propulsion Systems Center, Valiamala Email: gupta_nk(at)lpsc.gov.in
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