摘要：Efficiency is one of the most important parameters in evaluating the performance of a
gas turbine engine by increasing the turbine inlet temperature, which could increase the gas
turbine cycle’s efficiency. In order to increase the turbine inlet temperature significantly,
an advanced cooling system needs to be researched and developed. This paper
will establish a double chamber model simulating mist impingement cooling under typical gas turbine
operating conditions of high temperature and pressure. Numerical simulations are examined to investigate
the curvature and mist effect of air impingement cooling. The air
impingement cooling can be significantly affected by the curvature which is measured by
central angle. The 30° central angle model has a better cooling effectiveness than the
flat surface model, while the 90° central angle model has the lowest cooling performance.
Under real gas turbine operating conditions at high temperature, pressure, and velocity, comparing with the
90° central angle model, the 30° central angle model air impingement
cooling’s enhancement could be better than 98% and provides a wall cooling of approximately
175 K. By adding mist, impingement cooling effectiveness can be enhanced approximately
by 64% on the 90° central angle model and by 6–10% on the
other models.
