Influence of the Multicavity Shape on the Solid Scramjet

Pengnian Yang,Zhixun Xia,Yunchao Feng,Chaolong Li,Libei Zhao,Binbin Chen,Likun Ma,Zhen-Yu Tian

doi:10.1155/2021/9718537

Abstract

In this paper, a modular solid scramjet combustor with multicavity was proposed. The influence of multicavity shape on the performance of solid scramjet was investigated by the direct-connected tests. The experiments simulated a flight Mach 5.5 at 25 km. The boron-based fuel-rich propellant was used. The microstructure of combustion products was analyzed by SEM. The experimental results show that the fuel-rich mixture produced by the gas generator would ignite rapidly in the solid scramjet combustor. The combustion process showed a typical characteristic of establishment-development-maintenance-attenuation. Compared to the flame-holding cavity, the other shapes of cavities, e.g., narrow and lobe, can improve mixing and combustion. In our experiment, the combustion efficiency increased from 0.41 to 0.48, and the total pressure recovery was 0.36. In summary, the proposed solid scramjet combustor can effectively solve the ignition delay problem of the fuel-rich mixture, and the narrow/lobe cavity shows the ability to improve the mixing and combustion of the fuel-rich mixture.

Highlights

In recent years, the strategic value of the hypersonic vehicle has gradually become prominent and a hot research topic
The typical working process of solid scramjet (SSRJ) involves the selfsustained combustion of the fuel-rich solid propellant in the gas generator; this generates the fuel-rich mixture which is in turn injected into the SSRJ combustor, to combust with the airflow
The purpose of this study is to explore the working performance of a SSRJ utilizing a gas generator on both sides and to investigate the combustion enhancement effect of the multicavity device

Summary

Introduction

The strategic value of the hypersonic vehicle has gradually become prominent and a hot research topic. Current literature suggests that the former two configurations present several technical challenges, such as low combustion efficiency, difficulties in controlling the burning rate, and the inability to work stably for long periods of time [12,13,14]. To solve these problems, Lv et al proposed the SSRJ [15].

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