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Aerospace
Volume 8
Issue 5
10.3390/aerospace8050128
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Article
Peer-Review Record

Effect of Two-Head Flared Hole on Film Cooling Performance over a Flat Plate

Aerospace 2021, 8(5), 128; https://doi.org/10.3390/aerospace8050128
by Xuan-Truong Le 1, Duc-Anh Nguyen 1, Cong-Truong Dinh 1,* and Quang-Hai Nguyen 2
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Aerospace 2021, 8(5), 128; https://doi.org/10.3390/aerospace8050128
Submission received: 26 March 2021 / Revised: 19 April 2021 / Accepted: 21 April 2021 / Published: 4 May 2021
(This article belongs to the Special Issue Advances in Aerothermal Engineering)

Round 1

Reviewer 1 Report

  • 5 sig-figs for FE improvement? I'm not sure that's justified based on the model's assumptions. 60.8% is probably more accurate.
  • the  nomenclature list for all acronyms and symbols needs to be more extensive. Not sure exactly how you defined 'lateral-averaged effectiveness' vs. 'spatially-averaged effectiveness'. [You defined eta_s on p.4, but never eta_l.] Eta_s equation should be better formatted (e.g., denominator 21x4 is confusing)  
  • Discuss the effect of pressure ratio across the hole. The original hole geometry is cylindrical, which naturally limits the speed of the flow everywhere, as does the flared-inlet geometry. But the flared outlet geometry could become supersonic (con-di), if the pressure ratio is high enough and flow heating occurs in the hole. Figures 16-18 should show the flow speed profile as Mach contours instead of dimensional speed, to illustrate how close this is to choking.
  • Many typos need to be reviewed.

Author Response

Please see the detail of our answers in the attached file

Author Response File: Author Response.docx

Reviewer 2 Report

The paper presents a numerical study of film cooling performance and efficiency for a certain hole geometry that can be used in turbine blades. The authors use a commercial code (ANSYS CFX) to compute the 3-dimensional RANS turbulent flowfield through the cooling passage.  It is clear from reading the manuscript that the paper is well-thought and executed, with sufficient initial validation & verification steps that examine the fit of the model parameters and the numerical grid. The results are clear and convincing, and not at all insignificant: an increase in cooling performance/efficiency by a few percentage points is quite important. The only issue that I see with the paper is the 'placement' of the present work with respect to past work. There is an extensive list of past works (1-20) most of which (7-10, 12-20) examine the effect of the hole size, shape, geometry, fluid mechanics in a similar configuration. The authors need to clearly distinguish what in the paper is their own contribution, and how their numerical analysis and results advance the state-of-the-art in the topic. A little more clarity is necessary with regards to what is new in the present work, even if it comes out to be - at the end - nothing more than a quantitative increase of cooling performance.      

Author Response

Please see the detail of author answers in the attached file.

Author Response File: Author Response.docx

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