Abstract
This paper presents a CFD simulation analysis method for the regenerative cooling channel of a supercombustion ramjet engine, and performs three-dimensional modeling and analysis. The influences of inlet mass flow, inlet pressure, and inlet temperature on the flow and heat transfer characteristics of kerosene in the cooling channel were analyzed, and the conclusions are as follows: The larger the inlet mass flow, the lower the maximum wall temperature and oil temperature. The change trend of wall temperature is basically the same under different inlet pressure conditions, all of which increase violently first, then stabilize and then suddenly increase suddenly, then decrease almost to the outlet, and the temperature is almost the same under different conditions.As the inlet temperature decreases, the temperature difference between the wall surface and kerosene becomes larger, and the convective heat transfer coefficient gradually increases.
Highlights
With the increasing number of flying Mach numbers, the thermal protection problem of hypersonic vehicles becomes more and more serious
The inlet AO is the boundary condition for the mass flow into the inlet, mass flow ṁ = ṁ 0, inlet pressure p = p0, inlet temperature T = T0, turbulent kinetic energy k = k0, and turbulent dissipation rate = 0, where k0 and 0 are shown by equations (4) and (5)
In order to analyze the effect of different mass flow on the heat transfer performance of the cooling channel, this section only changes the kerosene inlet mass flow without changing the channel geometry, inlet temperature and inlet pressure, and simulates the situation of 10 different mass flow inlets
Summary
With the increasing number of flying Mach numbers, the thermal protection problem of hypersonic vehicles becomes more and more serious. The work of supercombustion stamping engines is in extreme harsh environments such as high speed, high heat flux density, high-intensity combustion, etc., and a feasible and reasonable thermal protection is urgently needed. With the continuous maturity of computer technology, numerical simulation has been widely used, and the research on regenerative cooling technology at home and abroad has achieved considerable achievements [2-10]. Most scholars have simplified the cooling channel based on the criterion relationship or based on some flow hypothesis to build a simple one-dimensional heat transfer model. There are relatively few numerical simulations of three-dimensional channels, and most of them have studied the heat transfer characteristics of the coolant in the channels, and there is less research on the effect of the inlet conditions of the coolant on the cooling efficiency. The flow and heat transfer characteristics of kerosene in the channel under different inlet mass flow, inlet pressure, and inlet temperature are analyzed
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