Introduction of a Supercritical Kerosene Test Bench Based on One-Stage Electric Heater with Large Current
A kind of supercritical kerosene heat transfer test bench was introduced in this article. It uses large current to heat the stainless steel tube directly and then the kerosene flowing inside the tube can be heated. A kind of needle valve is used to adjust the kerosene mass flow rate and a kind of backpressure valve is used to adjust the pressure inside the test tube. Insulating materials are laid at the two sides of the tube to prevent electrical leakage. Heat flux is calculated by measurements of the voltage and current. Kerosene is rapidly heated to high temperatures while the wall temperature is below the safety limit by increasing the tube length and thickness. The electric heater could effectively simulate the heat flux of a scramjet engine chamber with a maximum power of about 28KW. Kerosene within 15g/s could be quickly heated to 1000K with this system.
Experiments on supersonic combustion of supercritical kerosene
Characteristics of supersonic combustion by injecting supercritical kerosene fuel into a Mach 2.5 crossflow at various preheat temperatures and pressures were investigated experimentally.A two-stage heating system has been designed and tested,which can prepare heated kerosene of 0.8 kg up to 950 K at pressure of 5.5 MPa with minimum/negligible fuel coking.Supersonic combustion tests under the similar stagnation conditions and kerosene equivalence ratios demonstrated that the combustion efficiency when using supercritical kerosene injection increased approximately 10%~20% over that using liquid kerosene injection,while it was comparable to that using effervescent atomization.
Cooled Cooling Air Systems for Turbine Thermal Management
This paper evaluates the feasibility and potential impact on overall engine performance when utilizing the heat sink sources available in a gas turbine engine for improved turbine thermal management. A study was conducted to assess the application of a heat exchanger to cool the compressor bleed air normally used air for cooling turbine machinery. The design tradeoffs of this cooled cooling air approach as we’ll as the methodology used to make the performance assessment will be addressed.The results of this study show that the use of a cooled cooling air (CCA) system can make a positive impact on overall engine performance. Minimizing the complexity and weight of the CCA system, while utilizing advanced, high temperature materials currently under development provide the best overall solution in terms of design risk and engine performance.Copyright © 1999 by ASME