固体火箭技术2026，Vol.49Issue(2)：230-238,9.DOI:10.7673/j.issn.1006-2793.2026.02.007
突变截面和双脉冲燃烧室纵向声模态频率快速评估与验证
Rapid assessment and validation of longitudinal acoustic modal frequencies for abrupt area change and dual pulse chambers
摘要
Abstract
To investigate the longitudinal acoustic modal frequencies resulting from the geometric parameters of the acoustic cavity,theoretical formulas were developed based on the Rayleigh criterion to calculate the longitudinal acoustic modal frequencies of abrupt area change and dual pulse chambers rapidly.By analyzing the characteristics of the extreme points in the curves of the longitudinal acoustic modal frequencies with respect to the position of the abrupt cross-section or compartment,a method was proposed to determine the upper and lower bounds and verified through acoustic modal experiments under cold flow conditions.The abrupt area change chamber exhibits 2n extreme points along the L1/Lc curve and intersects the constant cross-section chamber at 2n+1 points,whereas the dual pulse type has 2n-1 extreme points and 2n intersections when L2/Lc≤1/(2n).The theoretical and experimental results show a relative error of less than 7%,with consistent frequency variation trends.This method enables rapid evaluation and qualitative analysis of the longitudinal acoustic modal frequencies in abrupt area change and dual pulse solid rocket motor chambers,thereby providing a reference for the preliminary design of the chamber.关键词
突变截面/双脉冲/燃烧室/声模态/快速评估Key words
abrupt area change/dual pulse/chamber/acoustic mode/rapid assessment分类
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申大鹏,史晓鸣,刘国刚,沈奕哲..突变截面和双脉冲燃烧室纵向声模态频率快速评估与验证[J].固体火箭技术,2026,49(2):230-238,9.
