Analysis and Consideration of Side Wall Effect on Flow Field in Clustered Linear Aero Spike Nozzles

In this research, toroidal and clustered linear aero spike nozzles were considered numerically with and without side walls to see the effects on flow field of base and plug and also on thrust coefficient. Considering flow pattern and analyzing results show that, the effect of 3d flow on linear aero spike nozzles could not be neglected. However, side truncation reduces weight, although is effective on overall thrust coefficient, adding wall authors to improve thrust coefficient, but because of more vice versa viscose force on longer walls, it could be commodious if absolute summation of forces increase thrust coefficient.Results of this research show adding side walls in the two nozzle type can be effective in improving thrust coefficient 12 to 31 percent (with attention to nozzle kind and width).