Theoretical, Numerical and Experimental Investigation of Secondary Injection with a Novel Pyrogenic Pulser

Abstract

In this paper, a novel pyrogenic pulser was designed both analytically and numerically and evaluated with empirical tests. The motivation of this study was the need for active control of the aero acoustic pressure oscillations by injecting the secondary flow into the solid rocket motor. First, in brief, pyrotechnic and pyrogenic pulsers have been introduced, and then analytical governing equations have been presented in three transient, sinusoidal and Hercules methods. In order to understand the internal pressure of the pulsar and its plume length, the injection flow field has been evaluated using the ANSYS-Fluent software with both − SST and − Realizable models both at ambient and motor pressure. After that, the design and manufacturing of the pulser hardware and the test process have been described. Finally, analytical, numerical and experimental results have been discussed. The results show that there is a good correlation between the transient analysis in theory and the numerical solution by the k-ω SST model and the empirical test data. In addition, pyrogenic pulsers design depends on various parameters of motor and pulser charge performance prediction. The quality of pulser charge bonding to its insulator and erosion of its throat path due to injection have an important role to obtain a desirable pulser mass flow rate and plume length.

Numerical Study on the Effect of Jet on the Operation of Powder Fuel Scramjet

“…At present, the fuel injection methods of scramjet are mainly side injection, and a large number of experimental and numerical studies have been carried out (Chapuis et al 2013;Smart et al 2006;Zhao et al 2016;You et al 2013;Mahesh et al 2013;Sun et al 2018;Liang et al 2018 and and found that the complex unstable shock wave structure, the shear layer and their interaction in the jet form a major pair of vortices, which have a significant impact on the fuel mixing in the downstream area. The results shown that by installing multiple side injectors on the combustion chamber, the jet diffusion, penetration, vortex effect and mixing efficiency of multiple injectors were improved compared with a single injector (Vatslya et al 2020;Pudsey and Boyce 2010;Gerdroodbary et al 2016;Huang et al 2018;Barzegar et al 2016, andTaherinezhad et al 2019 ). The wall injection has the advantages of simple structure, low thermal protection requirements and small total pressure loss.…”