Numerical Simulation of Axial-Flow Pump Cavitation Based on Variable Frequency Speed Regulation
Round 1
Reviewer 1 Report (New Reviewer)
The study investigates the cavitation evolution and the influence of cavitation on the performance of axial-flow pump under VVVF. Due to the cavitation is a very important part of pump operation, the study may make the users of the pump better choose the VVVF scheme of the axial flow pump. In this regard, the paper may be useful to the targeted community and can be accepted after the authors include the following comments.
1. Could you please reduce the description of the experimental method and incorporate the purpose and content of the experiment into the description of the experimental method.
2. Authors have used SST k- w model, which is not a new model. Whether the authors used the default constants values specified ( β*、β1、β2、σω2、σω3). How well these values suitable for current application in estimating the pump hydraulic performance.
3. The time step of numerical calculation should be mentioned. The grid interface GGI method used to average flow properties at the interfaces and to get more appropriate flow transfer, time step size is one of the important parameters. Similar with grid independence study, time step size independence also needs to be carried out.
4. The cavitation model used should be explained in detail.
5. Add quantitative or qualitative comparisons between CFD and model test. Add some quantitative analysis content.
6. Could you please distinguish between sections and subsections by using different fonts.
7. Could you please add the contents of the experimental equipment to the introduction and discuss the numerical simulation results together with the experimental results, which will make the structure of the article more satisfactory.
8. PDF manuscripts have some blurry images and high-definition is recommended.
Author Response
please see the word file
Author Response File: 
Author Response.doc
Reviewer 2 Report (New Reviewer)
The study investigates the cavitation evolution and the influence of cavitation on the performance of axial-flow pump under VVVF. Due to the cavitation is a very important part of pump operation, the study may make the users of the pump better choose the VVVF scheme of the axial flow pump. In this regard, the paper may be useful to the targeted community and can be accepted after the authors include the following comments.
1. Seems you are using font size to distinguish between sections and subsections., but could you change the font or add serial numbers to make it easier to distinguish.
2. The content of the article has been relatively complete, but there are still some structural problems. You can discuss numerical simulation and experimental results in one section, and experiment equipment, methods, etc., in the ''Introduction ''.
3. The spacing between characters in some parts of the article is too large, please adjust it appropriately.
4. There is too much about experimental methods in this article, which can be reduced appropriately. The purpose of the experiment can be included in the introduction without a separate title.
5. The description of the pressure drop circled in Figure 9 is somewhat redundant. Could you please delete this part.
Author Response
please see the word file
Author Response File: Author Response.docx
This manuscript is a resubmission of an earlier submission. The following is a list of the peer review reports and author responses from that submission.
Round 1
Reviewer 1 Report
The authors investigated axial-flow pump cavitation based on variable frequncy speed regulation. However, this paper is very difficult to understand because it does not follow the procedure of a typical academic paper. After Result and Discussion, Experimental works are presented.
The division of each section is ambiguous. It is difficult to distinguish between sections and subsections.
There are many errors in English expressions, and it is often difficult to understand. ex. the corresponding water body part was solved.
There is a lack of descriptions of pictures and methods. ex. It is hard to understand Figure 3
What position does Figure. 5 indicate?
It is difficult to understand due to the lack of explanation of the experiment.
Reviewer 2 Report
The study investigates the cavitation evolution and the influence of cavitation on the performance of axial-flow pump under VVVF. Due to the cavitation is a very important part of pump operation, the study may make the users of the pump better choose the VVVF scheme of the axial flow pum. In this regard, the paper may be useful to the targeted community and can be accepted after the authors include the following comments.
1.Seems you are proposing to study different VVVF schemes of axial flow pump. Could you describe the selection process in more detail? Please explain the method of simulation.
2. Could you please add more discussion about cavitation expect for axial flow pump? Such as cavitation in an inducer (Doi: 10.1007/s42241-021-0006-z) and in a centrifugal pump (Doi: 10.1177/0954406217753458)
3. Please add a more complete title to Figure 5.
4. Could you please give a paragraph summary of the visualization results of cavitation? It will help to draw experimental conclusions more easily.
5. The literature survey is good, but I suggest that the author cite several references related with the flow pattern on cavitation and energy conversion in Fluid Machinery. Moreover, I suggest that the author cite several references related with the present topic published in series of MDPI journals. Some reference are recommended to add in the revised manuscript: Very large eddy simulation of cavitation from inception to sheet/cloud regimes by a multiscale model; Boundary vorticity analysis and shedding dynamics of transient cavitation flow around a twisted hydrofoil.
