Parametric study on the performance of an expander bleed engine
Expander bleed cycles have a rather simple configuration when compared to other engine cycles, making them appealing when a new low-thrust engine must be designed. This type of cycles can only operate with light fuels that can be pumped in the liquid state and then properly expanded as a gas in the turbines. As a consequence of the limited amount of power provided by the coolant, expander cycles are characterized by a maximum thrust level of a few hundreds of kilonewtons. The present study focuses on the analysis of a liquid oxygen/liquid hydrogen expander bleed engine cycle dedicated to upper stage applications. A basic selection of all the key parameters defining the engine and its subsystems is carried out to obtain a specific configuration able to work at a prescribed working point. Starting from this configuration, a parametric analyses is performed to study the effect of single component properties and modelling on the expected overall engine performance.
mass flow rate
pump head coefficient
specific heat at constant pressure
thrust to weight ratio
turbine mass flow rate fraction
conic nozzle expansion angle
conic nozzle contraction angle
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