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Volume 9
Issue 11
10.3390/aerospace9110696
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Article
Peer-Review Record

Effect of Penetrative Combustion on Regression Rate of 3D Printed Hybrid Rocket Fuel

Aerospace 2022, 9(11), 696; https://doi.org/10.3390/aerospace9110696
by Xiaodong Yu 1,2, Hongsheng Yu 1,2, Wei Zhang 1,2,*, Luigi T. DeLuca 1,3 and Ruiqi Shen 1,2,*
Reviewer 1: Anonymous
Aerospace 2022, 9(11), 696; https://doi.org/10.3390/aerospace9110696
Submission received: 7 October 2022 / Revised: 31 October 2022 / Accepted: 5 November 2022 / Published: 7 November 2022
(This article belongs to the Special Issue Aerospace Combustion Engineering)

Round 1

Reviewer 1 Report

I thank the authors for submitting their work for consideration in this journal. The study is well conducted and the manuscript is well written. The authors have shown impressive improvement in regression rates. However, my concern is understanding the primary mechanism responsible for this. There are two effects at play here: penetrative combustion and 3D printing of ABS fuel grains. I understand that they may be interdependent, but the authors should isolate the effects. For example, what happens when the 3D-printed fuel grain is used in conventional combustion? Do you still see improvement? Such an analysis would help in understanding the mechanism behind the improvement.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The idea of ​​ the article and the results are interesting, but it raises doubts about the practical significance of this idea and the possibility of its implementation in the form of real fuel grain. In my opinion, there are several main obstacles to the use of such technology in practice:

1. The gain density is very low, which reduces the mass perfection of the rocket.

2. The effective grain web is very small (equal to the thickness of the bridges between the pores), which does not allow creating rocket engines with a long operation time. Such grains will have a short burning time and can be used in pulse engines.

3. This technology is very complex, which will significantly increase the cost of the grain and its production time compared to traditional technologies.

However, these comments are not related to the issue considered in this article (additive 3D technology for manufacturing a fuel grain and its combustion process), and do not affect the scientific significance of this work.

I recommend publishing the article.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

I thank the authors for working on my suggestions. I am now happy to recommend this manuscript for publication.

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