A PRELIMINARY STUDY OF SCRAM JET ENGINE USING STREAM THRUST ANALYSIS AND FIRST LAW AT DIFFERENT ALTITUDES

Venkata Hanuma Sai Teja T

Abstract: The SCRAM jet engine is a modification of the RAM jet engine and is capable of flying at speeds above Mach 5. In a SCRAM jet engine, the combustion takes place while the air is supersonic in nature. The purpose of the present work is to understand and model the components of a SCRAM jet engine and analyze them by the use of Thermodynamics. The First law of thermodynamics and Stream Thrust Analysis was used to determine pressure, temperature and thrust at different stations of the engine. Specific Thrust, Specific Impulse and Efficiencies were studied using both methods at altitudes 0(sea level), 15km and 25km. The assumptions, where necessary, were stated and followed. Independent parameters like cycle static temperature ratio and stream thrust were defined and studied. It was shown that the specific thrust and specific impulse increased with increase in altitude while the efficiencies decreased with altitude. A complex excel code was used to model the mathematics of the process.

Keywords: SCRAM Jet, Stream Thrust, Specific Impulse, Specific Thrust, Static Cyclic Temperature.

DOI: https://doi.org/10.15623/ijret.2016.0507003