Loading...

Design and Analysis of an Optimal Cooling System for a Supersonic Exhaust Diffuser Using a Water Jacket

Mahdian Dowlatabadi, Milad | 2021

346 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54421 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farahani, Mohammad; Fouladi, Nematollah
  7. Abstract:
  8. Often in a vacuum test facility, a supersonic exhaust diffuser uses the energy of the outflow from the nozzle to create and maintain a vacuum condition in the engine test chamber. In this system, the temperature of the motor exhaust gas, which directly hits the diffuser walls, is much higher than the tolerance of the metal body of the diffuser. The purpose of this research is to design a cooling system for thermal protection of diffuser walls of a vacuum simulator using a water-jacket tool. At the beginning of this study, the effective parameters in the design of the water-jacket cooling system were identified. Then, a new algorithm to design and optimize the water-jacket cooling system was developed considering the design goals and requirements. The designed system can use for high heat fluxes and large geometric dimensions. Three key parameters including cooling mass flow rate, channel height, and channel length are selected by the algorithm based on the proper distribution of heat flux over the diffuser's wall. In addition, control the maximum wall temperature, design simplicity, and the minimum total pressure drop are satisfied. Based on the problem definition and the diffuser heat flux distribution, moreover, the algorithm is capable of designing a multi-channel cooling system. Due to the deficiency of empirical and semi-empirical methods in estimating the heat transfer coefficient in such problem, a numerical simulation technique was used to validate the result. The design results with different conditions and requirements are also introduced and the developed numerical code capability is verified
  9. Keywords:
  10. Heat Flux ; Numerical Simulation ; Cooling ; Exhaust Diffusser ; Water Jacket ; Supersonic Exhaust Diffuser

 Digital Object List

 Bookmark

No TOC