Numerical Study on the Impact Pressure of Droplets on Wind Turbine Blades Using a Whirling Arm Rain Erosion Tester

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The correcting procedure for the impact pressure on the wind turbine blades proposed by the authors is valuable and meaningful for reference.

The manuscript itself is complete and does not need any more major revisions, just several spelling and language checks needed.

In addition, I think the paper is short in length and I wonder if there is a requirement for Fluids journal? If possible, it is hoped that the content of the Introduction section will be added to enrich the background investigation of this study.

Author Response

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Reviewer 2 Report

Comments and Suggestions for Authors

The authors used numerical simulation of liquid droplet impact by solving the N-S equations to assessed the impact pressure of droplets on a wet surface of wind turbine blades. By analyzing the influences of liquid-film thickness, impact velocity of droplet, radial distance on the impact pressure, the author obtained a method to evaluate the impact pressure on blades based on the test results of the whirling arm rain erosion tester, and applied it to the correction of the fatigue curve of fan blades.

This is an interesting work and has clear application potential. The text is well organized and the language is fluent. There are some minor problems in the manuscript, it is suggested to be published after minor revision.

Line 89, I don't think the semicolons is suitable here. The same problem occurs on the line 305.

Line 167, it is confusing to say ‘interaction of the liquid film with the blade’.

Line 381-382, if the nondimensional liquid-film thickness h/d on the rotating blade was determined using Eqs. (1) and (2), why the film thickness slightly decreases with increasing impact velocity V?  the variable V does not appear in Eqs. (1) or (2).

It is recommended to draw Fig. 9a and Fig. 9b together, so that it is easier to see the influence of the impact velocity.

Figure 10 and Figure 9 represent basically the same information, and it is recommended to remove one of them.

Author Response

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Reviewer 3 Report

Comments and Suggestions for Authors

This paper is organized well. The method is scientific and appropriate. The narrative is clear.

There are several minor mistakes: (1) in line 5, the number “1” after “Japan” should be deleted, (2) in line 68, there should be some word between “presented” and “the test results…”, (3) in line 89, “;” should be deleted. One advices: give more details about the numerical simulation method.

Author Response

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Reviewer 4 Report

Comments and Suggestions for Authors

The paper provides valuable information on the dynamics of the impact of liquid droplets on wind turbine blades and offers a method for a more accurate estimation of impact velocity. The work may be of interest to the scientific community in the area and the results seem potentially relevant to the renewable energy industry and could be useful in designing more efficient and durable wind turbine blades.

I suggest that the authors present an estimate of the numerical error of the results presented.

The work is well organized and I suggest its publication.

Author Response

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