Evaluation of Superposition Predictions for Showerhead Film Cooling on a VaneSource: Journal of Turbomachinery:;2015:;volume( 137 ):;issue: 004::page 41010DOI: 10.1115/1.4028708Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The leading edge of a turbine vane is subject to some of the highest temperature loading within an engine, and an accurate understanding of leading edge film coolant behavior is essential for modern engine design. Although there have been many investigations of the adiabatic effectiveness for showerhead film cooling of a vane leading edge region, there have been no previous studies in which individual rows of the showerhead were tested with the explicit intent of validating superposition models. For the current investigation, a series of adiabatic effectiveness experiments were performed with a fiverow and threerow showerhead. The experiments were repeated separately with each individual row of holes active. This allowed evaluation of superposition methods on both the suction side of the vane, which was moderately convex, and the pressure side of the vane, which was mildly concave. Superposition was found to accurately predict performance on the suction side of the vane at lower momentum flux ratios, but not at higher momentum flux ratios. On the pressure side of the vane, the superposition predictions were consistently lower than measured values, with significant errors occurring at the higher momentum flux ratios. Reasons for the underprediction by superposition analysis are presented.
|
Collections
Show full item record
contributor author | Anderson, Joshua B. | |
contributor author | Winka, James R. | |
contributor author | Bogard, David G. | |
contributor author | Crawford, Michael E. | |
date accessioned | 2017-05-09T01:24:30Z | |
date available | 2017-05-09T01:24:30Z | |
date issued | 2015 | |
identifier issn | 0889-504X | |
identifier other | turbo_137_04_041010.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/159913 | |
description abstract | The leading edge of a turbine vane is subject to some of the highest temperature loading within an engine, and an accurate understanding of leading edge film coolant behavior is essential for modern engine design. Although there have been many investigations of the adiabatic effectiveness for showerhead film cooling of a vane leading edge region, there have been no previous studies in which individual rows of the showerhead were tested with the explicit intent of validating superposition models. For the current investigation, a series of adiabatic effectiveness experiments were performed with a fiverow and threerow showerhead. The experiments were repeated separately with each individual row of holes active. This allowed evaluation of superposition methods on both the suction side of the vane, which was moderately convex, and the pressure side of the vane, which was mildly concave. Superposition was found to accurately predict performance on the suction side of the vane at lower momentum flux ratios, but not at higher momentum flux ratios. On the pressure side of the vane, the superposition predictions were consistently lower than measured values, with significant errors occurring at the higher momentum flux ratios. Reasons for the underprediction by superposition analysis are presented. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Evaluation of Superposition Predictions for Showerhead Film Cooling on a Vane | |
type | Journal Paper | |
journal volume | 137 | |
journal issue | 4 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.4028708 | |
journal fristpage | 41010 | |
journal lastpage | 41010 | |
identifier eissn | 1528-8900 | |
tree | Journal of Turbomachinery:;2015:;volume( 137 ):;issue: 004 | |
contenttype | Fulltext |