Search Result

Srl

Item

ID: 149008

Aerodynamic characterisation of ramjet missile through combined external-internal computational fluid dynamics simulation / Bhandarkar, Anand ; Chakraborty, Debasis ; Manna, P ; Basu, Souraseni

Chakraborty, Debasis	Journal Article
	0 Rating(s) & 0 Review(s)

Summary/Abstract

Combined external-internal flow simulation is required for the estimation of aerodynamic forces and moments of high speed air-breathing vehicle design. A wingless, X-tail configuration with asymmetrically placed rectangular air intake is numerically explored for which experimental data is available for different angles of attack. The asymmetrically placed air intakes and protrusions make the flow field highly three-dimensional and existing empirical relations are inadequate for preliminary design. Three dimensional Navier Stokes equations along with SST-kω turbulence model were solved with a commercial CFD solver to analyse the combined external and internal flow field of the configuration at different angles of attack. Estimated aerodynamic coefficients match well with experimental data and estimated drag coefficient are within 8.5 per cent of experimental data. Intake performance parameters were also evaluated for different angles of attack.

Key Words

Computational Fluid Dynamics ; CFD ; Ramjet ; Drag Coefficient ; Pressure Recovery ; Mass Capture Ratio

In Basket

Export

ID: 169542

Currency and finance department: the heart of the foreign ministry / Idrisov, B

Idrisov, B	Journal Article
	0 Rating(s) & 0 Review(s)

Summary/Abstract

Question: Boris Galeyevich, you have worked at the Foreign Ministry's central office, the currency and finance division, and Soviet and then Russian missions abroad. Surely you were lucky enough to work together with Currency and Finance Administration/ Currency and Finance Department [CFA/CFD] legends?

Key Words

CFD ; Currency and Finance Department ; CFA/CFD Veterans ; Currency and Finance Administration

Links

'Full Text'

In Basket

Export

ID: 141862

Numerical characterisation of jet-vane based thrust vector control systems / Murthy, M S R Chandra; Chakraborty, Debasis

Murthy, M S R Chandra	Article
	0 Rating(s) & 0 Review(s)

Summary/Abstract

Computational fluid dynamics methodology was used in characterising jet vane based thrust vector control systems of tactical missiles. Three-dimensional Reynolds Averaged Navier-Stokes equations were solved along with two-equation turbulence model for different operating conditions. Nonlinear regression analysis was applied to the detailed CFD database to evolve a mathematical model for the thrust vector control system. The developed model was validated with series of ground based 6-Component static tests. The proven methodology is applied toa new configuration.

Key Words

Jet Vanes ; CFD ; Nonlinear Regression Analysis ; Thrust Vector Control

In Basket

Export

ID: 141863

Numerical study of pulse detonation engine with one-step overall reaction model / Srihari, P; Mallesh, M A ; Prasad, G Sai Krishna ; Reddy, D N

Srihari, P	Article
	0 Rating(s) & 0 Review(s)

Summary/Abstract

This paper presents an insight for the study of transient, compressible, intermittent pulsed detonation engine with one-step overall reaction model to reduce the computational complexity in detonation simulations. Investigations are done on flow field conditions developing inside the tube with the usage of irreversible one-step chemical reactions for detonations. In the present simulations 1-D and 2-D axisymmetric tubes are considered for the investigation. The flow conditions inside the detonation tube are estimated as a function of time and distance. Studies are also performed with different grid sizes which influence the prediction of Von-Neumann spike, CJ Pressure and detonation velocity. The simulation result from the single-cycle reaction model agrees well with the previous published literature of multi-step reaction models. The present studies shows that one-step overall reaction model is sufficient to predict the flow properties with reasonable accuracy. Finally, the results from the present study were compared and validated using NASA CEA.

Key Words

Numerical Simulation ; CFD ; Pulse Detonation Engine

In Basket

Export