Abstract
The high temperature and high pressure supersonic jet is one of the key problems in the design of solid rocket motors. To reduce the jet temperature and noise, cooling water is typically injected into the exhaust plume. Numerical simulations for the gas-liquid multiphase flow field with mixture multiphase model were developed and a series of experiments were carried out. By introducing the energy source terms caused by the vaporization of liquid water into the energy equation, a coupling solution was developed to calculate the multiphase flow field. The temperature data predictions agreed well with the experimental results. When water was injected into the plume, the high temperature core region area was reduced, and the temperature on the head face was much lower than that without water. The relationship between the reduction of temperature on the bottom plate and the momentum ratio is developed, which can be used to predict the cooling effect of water injection in many cases.
Highlights
Supersonic high-temperature exhaust plumes cause rocket engine damage on the launcher and surrounding equipment
The launcher, the diversion trench and even the missile are directly affected by jet exhaust
The results showed that the loss of heat flux caused by the vaporization and the momentum of water flow were the main factors that affected the exhaust jet
Summary
Supersonic high-temperature exhaust plumes cause rocket engine damage on the launcher and surrounding equipment. The results showed that the loss of heat flux caused by the vaporization and the momentum of water flow were the main factors that affected the exhaust jet. Cho [9] investigated the effect of coolant injection to small-scale diffuser, and the results indicated that the ratio between gas and water mass flow rates is an important parameter in determining the cooling characteristics. Krothapalli and his co-workers [10,11,12] studied the effect of different size droplets. The gas-liquid multiphase field of rocket exhaust plumes with water injection was studied by subscale testing and numerical simulation.
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