0
research-article

Experimental and Numerical Analysis of Additively Manufactured Coupons with Parallel Channels and Inline Wall Jets

[+] Author and Article Information
Sarwesh Narayan Parbat

Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, PA 15261, USA
snp34@pitt.edu

Li Yang

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
thudteyl@gmail.com

Zheng Min

Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, PA 15261, USA
zhm10@pitt.edu

Dr. Minking K. Chyu

Department of Mechanical Engineering and Material Science, University of Pittsburgh, Pittsburgh, PA 15261, USA
mkchyu@pitt.edu

1Corresponding author.

ASME doi:10.1115/1.4041821 History: Received September 23, 2018; Revised October 21, 2018

Abstract

Present paper developed a series of additively manufactured parallel cooling channels with streamwise wall jets inside, which could be suitable for double wall and near wall cooling configurations in gas turbine hot section components. The tested coupons consisted of parallel channels, each channel further divided into small chambers using several spanwise separation walls. Height of these walls was kept less than channel height, thus forming a slot with one of the end walls. Coolant entered from one side of channel and formed streamwise wall jet while crossing through the slot over to the downstream chamber. The test coupons were additively manufactured by Selective Laser Sintering technique using Inconel 718 alloy. Steady state heat transfer experiments with constant wall temperature boundary condition were performed to analyze effect of pitch between subsequent slots, and, blockage ratio (ratio of separation wall height to channel height) on heat transfer. The channel Reynolds number ranged from 1800 to 5000. Numerical simulations were performed using ANSYS CFX solver with SST k-? turbulence model to obtain detailed understanding of existing flow field. Experimental results showed heat transfer enhancement of up to 6.5 times that of a smooth channel for the highest blockage ratio of 0.75. Numerical results revealed complex flow field which consisted of wall jets along with impingement, separation and recirculation zones in each chamber. For all configurations, gain in heat transfer was accompanied with high pressure drops. However, coupled with the high heat transfer, this design could lead to potential coolant savings.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In