Investigation and Improvement of Thermal Efficiency of Hypersonic Scramjet

Abstract

This work is focused on investigation of thermal efficiency of a Hypersonic scramjet engine and propose some improvement of thermal efficiency based on thermodynamic and fluid flow analysis. Thermal management system is one of the main research fields in scramjet design. As it has no moving parts, the total thermal efficiency depends on inlet conditions, conditions of combustor exit and conditions of the engine exit. A combustor exit condition dictates the velocity and temperature after combustion. we concentrate our focus on this section. The first part of the paper, we tried to describe the fundamental exergy relationship for scramjet and we developed the relation of exergy distribution and exergy delivery rate. From an extensive literature review, we have found the relations between fluid velocity, pressure and temperature, which is described in the later part of the paper. Our main focus is to develop a combined relation of thermal efficiency in terms of engine exit velocity, temperature and air-fuel ratio. Different characteristic parameters such as overall efficiency, thermal efficiency, specific impulse have been determined at different inlet temperature ratio or the cycle static temperature ratio (T3/T0) and an optimum inlet temperature ratio is proposed for maximum overall efficiency.

Thermal Protection System and Thermal Management for Combined-Cycle Engine: Review and Prospects

“…The experimental results show that thermal compression is an effective method to increase the combustion pressure of scramjets, and thermal compression can effectively increase the chemical activity of the fuel and thereby the thrust of the engine can be improved. In a study by Hossain [109], the theoretical value of thermal efficiency of ramjets was calculated based on the heat conduction equation. The thermal efficiency of ramjets mainly depends on numerical conditions at the inlet and outlet of the combustion chamber and the engine outlet.…”

Influence of nonlinear radiation on natural convection flow of carbon nanotubes suspended in water-based fluid along a vertical wavy surface

“…The enhancement of thermal efficiency in the field of microfluidics, transportation, microelectronics, manufacturing and medicine has been an objective of scientists and engineers in recent years [1][2][3]. The use of nanomaterials as an additive is a major source to enhance the thermal efficiency of electronic devices and fluids.…”