The Effect Of Inhibitors And Injection Parameters On The Exhausted Gas Flow Field In The Magazine

Warship fire，especially in the situation of accidental ignition of SRM in the magazine, isvery harmful to the safety of the ship if the fire can not be effectively suppressed. During thistime, in order to drain the high temperature and high pressure gas, the exhaust hole must beturned on. At the same time, there will be some outside air sucked into the magazine from theedge of the exhaust hole, which will cause secondary hazards easily. Therefore, the study onthe types of inhibitor, the way of injection and the related parameters have significanct effecton safe exhaust of high temperature gas flow field and suppression of secondary combustionin the magazine.In this article, numerical simulation based on the model of multi-component finite ratechemical reactions is carried out in the case of SRM accidental ignition. The results show thatthe types of inhibitor, the way of spraying and the mass rate of flow take the important role ofsuppressing the secondary combustion. The comparative analysis for different conditions iscarried out. The main conclusions are as follows:1. For2inhibitor nozzles spraying, the cases of three kind of inhibitors and3mass ratesare calculated to study exhausted gas flow fields in the magazine. It is found that the coveragerange of inhibitor to exhaust hole is most large for m=0.1k g/s, which meant the outside airis prevented more effectively from being sucked into the magazine. The results showed thevarious effects for HALON1301, CO₂and IG-100N₂with the3mass rates are different. Forthe case of m=0.1k g/s, the minimum average temperature in the magazine drops about200K for HALON1301; For the case of m=0.1k g/s, the minimum average temperature inthe magazine dropped about150K with CO₂and100K with IG-100N₂respectively. Thedistribution of the gas component in the magazine is obtained in the situations of differenttypes and different mass rates of inhibitor.2. In the case of4inhibitor nozzles spraying and the mass rates of HALON1301withm=0.07kg/sand m=0.1k g/s, it is found that the coverage range of inhibitor to exhausthole increase more than that of two inhibitor nozzles spraying. The defect is that the realexhaust area is decreased，which may lead to the rise of pressure of magazine.3. For two different injection modes, it is found that the temperature and the gas components in the magazine are not only related to the type of inhibitor, mass of flow, butalso related to the injection of the inhibitor.