Ice Distribution Characteristics on the DU25 and NACA63-215 Airfoil Surfaces of Wind Turbines as Affected by Ambient Temperature and Angle of Attack

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The paper's topic (Ice distribution characteristics on DU25 and NACA63-215 airfoil surfaces of wind turbines as affected by ambient temperature and angle of attack) needs some revisions before publishing. Please address the following comments:

1. Referencing the main results of the abstract is recommended.

2. Previous research was not described in the introduction section. It is advised to explain more about the current references.

3. For the leading edge of airfoils, the ice distribution range on the upper surface of the DU25 airfoil (0 - 3.07 mm) is wider than that of the NACA63-215 airfoil (0-1.91 mm), while the ice distribution range on the lower surface of DU25 airfoil (0–12.13 mm)  is narrower than that of the NACA63-215 airfoil (0–15.18 mm). It is recommended to clarify this case.

4. Why does the maximum error point at the ice horn?

5. The peak droplet collection efficiency on the surface of the NACA63-215 airfoil (0.72) is higher than that of the DU25 airfoil  (0.59). Explain this phenomenon.

6. The distribution range of droplet collection efficiency on the DU25 airfoil surface is wider than that of the NACA63-215 airfoil. It is recommended to provide the argument for this.

7. The peak ice thickness changes significantly at ambient temperatures of 258–268 K compared to that at ambient temperatures of 248–258 K at an angle of attack of 0°. It is recommended to provide the argument for this.

8. Why does the angle of attack have a much greater effect on the peak ice thickness than ambient temperature?

9. English needs to be improved. 

Comments on the Quality of English Language

9. English needs to be improved. 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

Manuscript ID: coatings-3082411

Comments to the Authors:

 The authors investigate how angle of attack and ambient temperature affect the predicted ice distribution characteristics on the DU25 and NACA63-215 air foil surfaces of wind turbines. The manuscript can be improved if the authors can revise the following points:

1.    The introduction should be more coherently structured, with smoother transitions between the topic discussion, literature review, and description of the goals and gaps in the research.

2.    It is necessary to verify and clearly state the description of the equation and the source of this content.

3.    The model validation section effectively compares numerical simulation with experimental data under specified icing conditions. Please, how can the author show good agreement in ice distribution with errors mostly within 2%, highlighting the maximum error at the ice horn due to variations in heat flux caused by unfrozen water film on the blade surface?

4.    The results effectively analyze ice distribution on DU25 and NACA63-215 airfoil surfaces across varying ambient temperatures and angles of attack. Figures 4-6 show reduced peak ice thickness with increasing temperature, while Figures 7-9 highlight differences in droplet collection efficiency and ice distribution between the airfoil types. Figures 10(a) and (b) summarize how temperature and angle of attack influence peak ice thickness. The authors should clarify transitions between figures, which could further enhance coherence in this section.

5.    Finally, the authors should explore how airfoil design characteristics, like camber and thickness, interact with ice accumulation patterns to optimize future wind turbine blade designs.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

Accept in present form.