چكيده به لاتين
Dual Swirl Coaxial Injector are widely used in liquid rocket engines. Their advantages include high performance, uniform mixing and distribution of propellants, as well as the need for a lower level of precision for manufacturing technology. In this research, an externally Dual Swirl Coaxial Injector is designed. As the fluid passes through the tangential inlets, an angular momentum is applied to the fluid, causing the fluid to rotate. Under the influence of centrifugal force, the rotating hollow conical plate is observed centrally by the internal and external injectors, where the internal injector spray is surrounded by the external injector spray and combines outside the injector orifice.The method proposed for injector design in this research is based on the design method by Bazarov and Yang. For the built injector, in cold tests with water, mass flow and discharge coefficient of internal and external parts were measured.For internal injector with increasing injection pressure from 0.50 bar to 7.55 bar, discharge coefficient decreases from 0.203 to 0.195 and for external injector with increasing injection pressure from 0.15 bar to 91.6 bar, coefficient Discharge decreases from 0.092 to 0.084. Next, using the imaging method, the angle and length of the collapse of the spray output from the injectors, when each is sprayed separately, were investigated. Then, the conditions of the merger and separation process when the fluid exits both injectors simultaneously were investigated. When the internal injector injection pressure is more than 0.1 bar and the external injector injection pressure is between 0.30 bar and 0.95 bar, the internal injector plate pulls the external injector plate towards itself. Also, when the internal injector injection pressure is more than 0.8 bar and the external injector injection pressure is more than 0.95 bar, the external injector plate pulls the internal injector plate towards itself; And at these points of the injection pressure, the sprays are always in a state of integration. Finally, the angle and length of the collapse of the spray joint were measured when the pressure was constant for the internal injector and the pressure was increased for the external injector, and vice versa, the angle and length of the collapse of the spray joint were measured.
