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Recently, advanced aero-engines have become more and more important in the development of society, which are expected to be capable of higher and higher flight Mach number to meet the needs of modern life. However, considering the high total temperature of freestream and serious aerodynamic heating with high Mach numbers, the cooling and energy management thus become a serious challenge. Taking scramjet...
The working process of an advanced aeroengine such as scramjet with endothermic hydrocarbon fuel cooling is a chemical recuperative cycle. The design of cooling channel in terms of engine real working conditions is very important for the chemical recuperation process. To study the effects of channel aspect ratio (AR) on chemical recuperation process of advanced aeroengines, three dimensional model...
The working process of scramjet with regenerative cooling, which was actually the chemical recuperation process, was analyzed in view of energy cascade utilization. The indirect combustion was realized through pyrolysis reaction of fuel. The relative yields of thermal exergy obtained by indirect combustion have been predicted both assuming an ideal pyrolysis reaction and using the experimental results...
In order to predict the maximum performance of scramjet engine at flight conditions with high freestream Mach numbers, a thermodynamic model of Brayton cycle was utilized to analyze the effects of inlet pressure ratio, fuel equivalence ratio and the upper limit of gas temperature to the specific thrust and the fuel impulse of the scramjet considering the characteristics of non-isentropic compression...
In order to evaluate the performance of a new power generation system in which the generator is driven by the fuel vapor turbine, the pyrolysis characteristics and the compositions of pyrolyzed fuel mixture are experimentally studied. An algorithm is developed for the calculation of isentropic enthalpy drop of fuel vapor using a real gas model based on the SRK (Soave–Redlich–Kwong) equation of state...
Advanced aeroengine with endothermic hydrocarbon fuel cooling works as chemical recuperative cycle. In order to study the thermal management of fuel in view of chemical recuperation, models of flowing cracked hydrocarbon fuel inside engine cooling channels are developed and validated. Based on 1-D model, different methods are put forwarded to control the chemical recuperation effectiveness and effective...
The aim of this work is to provide an upper estimate of the theoretical maximum specific thrust of the hydrocarbon fueled scramjet. An idealized thermodynamic cycle analysis is carried out to evaluate the performance of scramjet engines at different flight conditions, inlet pressure ratio and fuel equivalence ratio. Contrary to known Brayton cycles for the gas-turbine and ramjet engine, the inherent...
Thermal management of fuel is very important for the cooling system of an advanced engine. In order to study the 3-D phenomena of fuel flow with cracking reaction in the cooling channels and their effect on the utilization of fuel heat sink, numerical models of cracking fuel flow in an asymmetrically heated rectangular tube are built on the basis of the real fuel thermophysical properties using commercial...
The method to improve the heat sink utilization of fuel is the primary issue for thermal management of advanced aeroengines. In order to study the methods to control the fuel heat sink utilization, a one dimensional model of flow and heat transfer process in a single cooling channel of endothermic hydrocarbon fuel cooled scramjet in terms of endothermic reaction is developed, which is validated by...
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