Defence Research and Development Laboratory

About: Defence Research and Development Laboratory is a facility organization based out in Hyderabad, India. It is known for research contribution in the topics: Turbulence & Mach number. The organization has 404 authors who have published 420 publications receiving 4183 citations. The organization is also known as: DRDL.

Computational Fluid Dynamics in Aerospace Industry in India

Abstract: The role of computational fluid dynamics (CFD) in the design of fighter aircraft, transport aircraft, launch vehicle and missiles in India is explained. Indigenous developments of grid generators, 3-D Euler and NavierStokes solvers using state-of-the-art numerical techniques and physical models have been described. Applications of these indigenous softwares for the prediction of various complex aerodynamic flows over a wide range of Mach number, angle of attacks, are presented. Emergence of CFD methods as an efficient tool for aerospace vehicle design is highlighted.

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

Abstract: Galling is the surface phenomenon which involves adhesion of local contact points and creation of protrusions on the juxtaposition of surfaces owing to high friction, inappropriate tribological loading, starved lubrication and high contact pressure (~ 1000 kPa). All these factors result in severe plastic deformation varying from 8000 to 10,000 µe (e-strain) and diffusion of materials into one another, which consequently results in fatigue wear, surface roughness, tribocorrosion and seizing up of critical parts. The aim of the review is to analyze and summarizes the issue of galling, concurrently it also deals with the novel and economical mitigation method i.e. use of fluorine based coatings e.g. PTFE, owing to their lowest friction coefficient from 0.02 to 0.2 among other solids, high stiffness, high thermal stability and non-adherent characteristics that augments the mechanical and tribological properties and concurrently protect against hostile environments that eventually upsurges the life of components.

Microelectrochemical sparks machining: a modern approach for fabrication of microcomponents from nonconductive materials

Abstract: Microelectro-chemical spark machining (micro-ECSM) is a novel hybrid unconventional machining process which has the capability to fabricate sophisticated and intrinsic microcomponents with high-dimensional accuracy. It is based on the principle which combines the microelectrochemical and microelectric discharge machining process. This process has potential to machine both conductive as well as nonconductive material with high precession without any physical contact, which makes it a unique machining process and raises its demand in different fields starting from aviation to medical sector. The present article describes the mechanism of spark formation and material removal process. The tool feed mechanism and the variants of the micro-ECSM process are elaborated. This article also outlines the various material machined by micro-ECSM process and the enhancements of the machining potential by its hybrid variant and provides new prospect in technological advancement of micro-ECSM process.