Large-area specific spray pipe lateral load prediction method and device and medium

Abstract

A large-area-ratio spray pipe lateral load prediction method comprises the following steps; firstly, establishing a spray pipe model, and dividing the spray pipe model into grids; Determining combustion gas parameters; 2, presetting initial conditions of a flow field in the spray pipe and boundary conditions of the spray pipe; Step 3, performing constant calculation on the discretized complete NSequation set to obtain a flow field density distribution value, a flow field pressure distribution value and a flow field temperature distribution value; 4, comparing the pressure distribution value of the wall surface of the spray pipe with the pressure distribution value of the wall surface of the spray pipe obtained by the test to obtain a comparison result, when the comparison result is greater than a preset value, turning to the step 5, otherwise, turning to the step 6; 5, combustion gas parameters are adjusted, and then the step 2 is executed; And step 6, taking the actual pressure of the spray pipe as the outlet pressure of the spray pipe, performing unsteady calculation on the discretized complete NS equation set, and obtaining the actual pressure distribution value of the wall surface of the spray pipe so as to predict the lateral load of the spray pipe.

Description

technical field [0001] The invention relates to a method, device and medium for predicting the lateral load of a nozzle with a large area ratio, and belongs to the technical field of high-thrust rocket engine propulsion. Background technique [0002] With the rapid development of aerospace propulsion technology, more and more modern rocket engines use large-area nozzles to obtain high propulsion efficiency and large specific impulse to improve the performance of the entire rocket. However, the working environment of the rocket engine nozzle will span a wide range of altitudes. In order to obtain acceptable performance during the whole flight, the nozzle is designed for the pressure of the intermediate environment, and in most cases, the large area ratio nozzle When the tube works under non-design conditions, when the back pressure is higher than the design value to a certain extent, the nozzle will be in a serious over-expansion state, and the complex shock wave evolution pr...

AI Technical Summary

Problems solved by technology

However, because the physical mechanism of nozzle side load is very complex and sensitive to many factors, there is still no clear conclusion

At present, the industry generally relies on a large number of experiments and conservative design to solve this problem, which to some extent results in the waste of research and development costs and the sacrifice of nozzle performance.

Images