Abstract
This abstract presents an endwall heat transfer experimental data of air flow going through outlet guide vanes (OGVs) situated in a low speed linear cascade. The measurement technique for this experiment was infrared thermography. In order to calculate the heat transfer coefficient (HTC) on the endwall, it has been used an instrumented window with a controlled constant temperature in one side of a 5 millimeter Plexiglass in order to generate high temperature gradients and, therefore, by measuring the surface temperature one the other side of the Plexiglass, it is calculated the HTC. Due to the fact that Plexiglass material has not good optical properties at infrared spectrum, it has been used a thin layer of black paint (10-12 μm) which has high emissivity (0.973) in the range of temperature that we are working. The Reynolds number for this experiment is 300000 in on and off-design configuration of the OGVs (on-design 25° and off-design cases are 40° and-25° incident angle). Furthermore, the on-design case is run at two different Reynolds number, 300000 and 450000. During this experiments it can be seen how changing the inlet angle to the OGVs produces significant differences on the heat transfer along the endwall. The main objective for this investigation is to study the heat transfer along the endwall of a linear cascade so that it would be a well-defined test case for CFD validation.
Highlights
Demands from industry on improving the efficiency in all kind of energy systems, including aero engines, are leading to focus on the research in more efficient propulsion systems
This paper is focused in the study of the heat transfer on the surface of a vane and endwalls situated in a lowspeed linear cascade
The heat transfer study performed can help to understand better the complex heat transfer mechanisms involved in this case, and the information can be used for CFD validation purposes
Summary
Demands from industry on improving the efficiency in all kind of energy systems, including aero engines, are leading to focus on the research in more efficient propulsion systems. There are several ways to increase the energy efficiency in jet engines, i.e. increasing by-pass ratio, raising the combustion temperature, decreasing the weight of any component in the aircraft etc. This paper is focused in the study of the heat transfer on the surface of a vane and endwalls situated in a lowspeed linear cascade. Knowing the heat transfer mechanisms involved can lead to predict accurately the maximum temperature or thermal load on the surface of this component, and estimate the cooling if needed or select a lighter material that can handle the predicted thermal loads without melting or being sensitive to creep. This work is a continuation of previous investigation in a large-scale linear cascade performed at Chalmers University of Technology [7],[8]. An additional motivation for this work is the comparison between the experimental results using two different heat transfer measurement techniques
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
