Abstract
The work is focused on the performance estimation and control of a cold flow inside a ramjet test engine, which initially operates without combustion, preparing the flow for the main propulsive phase. To achieve this objective, a “connected pipe” test bench was assembled. Flow management was performed using the control valve that allows regulating pressure and air mass flow rate in the engine according to its flight conditions through sensors installed at relevant positions. The proportional, integral and derivative (PID) parameters for the flow control algorithm were studied in order to guarantee the stable operation of the engine and correspondence of the flow parameters to predicted ones by the analytical modeling. Experimental results were validated by the numerical and analytical compressible flow models.
Highlights
A ramjet is an airbreathing engine that is characterized by having no compressor and turbine sections, unlike a turbofan engine, used in commercial aircrafts
To achieve the main objective of the work, a ramjet engine test bench has been set up, a proportional, integral and derivative (PID) control system has been implemented and a cold flow model based on the isentropic compressible flow equations, according to Anderson (2016), has been constructed
The most relevant data obtained from the cold flow test are illustrated in Figs. 6 to 10
Summary
A ramjet is an airbreathing engine that is characterized by having no compressor and turbine sections, unlike a turbofan engine, used in commercial aircrafts. Flow compression is performed by means of a supersonic diffuser that transforms the kinetic energy of the flow into potential energy, increasing its pressure and temperature. After this process, fuel is mixed with air in the combustion chamber, and this mixture, which constitutes the propellant, is burned (Sutton and Biblarz 2010; Hill and Peterson 1992). The ramjet engine is generally used in missiles, but its simplicity increase goes along with a limitation: it cannot produce static thrust and cannot operate from rest (Hill and Peterson 1992). Its operating altitude is limited as it depends on the air intake
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