This paper focuses on researching the flowage characteristics of flow and the radiation characteristics of flow to the bottom of the rocket in the case of different height of fly and average diameter of nozzle.The author adopts k-εTurbulence Method and Discrete Ordinates Method and CFD technique to do 3-D Numerical Simulation for plume field of the rocket engine with four nozzles.The result showed that the verge of flow became wider and longer when the height of fly increased,the flow became longer when the distance between nozzles became shorter.The height of fly had a great impact on density of radiation heat flow in the bottom of the rocket.When the distance between nozzles became shorter, density of radiation heat flow in the bottom of the rocket increased and high temperature area became larger.The research result had been of great value for the whole design of multi-nozzle rocket.

This paper focuses on researching the flowage characteristics of flow and the radiation characteristics of flow to the bottom of the rocket in the case of different height of fly and average diameter of nozzle. The author adopts k- turbulence method and discrete ordinates method and CFD technique to do 3-D numerical simulation for plume field of the rocket engine with four nozzles. The result shows that the verge of flow became wider and longer when the height of fly increased,the flow became longer when the distance between nozzles became shorter. The height of fly had a great impact on density of radiation heat flow in the bottom of the rocket. When the distance between nozzles became shorter,density of radiation heat flow in the bottom of the rocket increased and high temperature area became larger. The research result had been of great value for the whole design of multi-nozzle rocket.

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