Abstract: A research had been done to study the effects of venturi length of swirl cup on the carbon deposi tion of venturi by combustion experiments in quantification and numerical simulation analysis. Three variations of venturi lengths were made. The distances between venturi throat and nozzle exit of case A， B， C are 6mm，8mm，10mm respectively. Comparative analyses were conducted for above parameter in terms of the flow field，temperature field and carbon deposition characteristics in the swirl cup and the downstream. The experimental re sults show that the carbon amount on the inwall decrease with the increase of venturi length and the amount of re duction of case C can reach 99% by comparison to case A. Meanwhile，the numerical results indicate that the length of venturi has no discernable impact on the flow field and temperature field in the downstream of the swirl cup. However，the front stagnation points of the primary recirculation zone can be moved from the nozzle to the exit of the venture in path with the length increase. In addition，the peak value and distribution area of negative velocity and temperature near the venturi throat will have a dramatic reduction with the greatest amplitude be tween case A and C come to 99% and 35% respectively. Thus，increasing the length of venturi to a certain de gree can lead to the carbon on the venturi sharply decrease，which has guiding significance for the structural design of the swirl cup.design of the swirl cup.

Key words: Aero-engine；Combustor；Swirlcup；Venturi；Carbondeposition

摘要： 研究了三个不同长度旋流杯文氏管的积碳特性。方案A，B，C文氏管喉道位置至喷嘴出口距离依次为6mm，8mm，10mm。通过热态燃烧试验定量比较了三个方案文氏管的积碳量，并利用数值模拟分析了文氏管长度对旋流杯内部及下游的热态流场，温度场以及积碳特性的影响。试验结果显示随着文氏管长度的增加，其内壁上的积碳量随之减小，方案C相较于方案A减小幅度达到99%。数值模拟结果则发现:文氏管长度对旋流杯下游流场及温度场影响较小，但是增加文氏管长度会使中心回流区上止点由上游喷嘴处向下游文氏管出口移动，文氏管喉道附近的负速度区域和高温区域减小，方案C相较于方案A负速度及温度峰值减小幅度分别达到99%和35%。因此，适当增加文氏管长度有利于减少燃油在文氏管上的积碳，对旋流杯的结构设计具有指导作用。

关键词: 航空发动机；燃烧室；旋流杯；文氏管；积碳中图分类号:V231.2文献标识码:A文章编号:1001-4055(2015)12-1833-06DOI:10.13675/j.cnki.tjjs.2015.12.011