Influence of Hydraulic Parameters on Multi-Stage Pulse Characteristics of Pressurized Pulsed Water Jet

Round 1

Reviewer 1 Report

The authors published research into raise the initial pulse velocity of the pressurized pulsed water jet, on the strength of the pressurized pulsed water jet flow field capture system and were researched the results of the initial pressure of the pressurized cavity and the driving pressure on the multistage pulse of the jet. The experiments show that with the increase of the initial pressure of the booster chamber, the jet changes from discontinuous state to continuous state, and the multistage pulse changes from dominant multi-pulse to recessive multi-pulse at the same time.

The authors presented the aim of the work not very clearly. However, they certainly did not consider the research gap that should be specified after analyzing the literature.

The paper is remarkably interesting, good fits the profile of the Processes journal but requires some change in the following scope:

1.       The analysis of the state of art is modest and does not include many European and world sources, mainly Asian ones. This must be changed, taking into account the works of Mohan Vijay, Josef Foldyna, Sergej Hloch.

2.       The authors presented the aim of the work not very clearly.

3.       They certainly did not consider specification of the research gap that should be given after analyzing the literature.

4.       Chapter 2 Experimentation. We put a space between the value and the unit, e.g. it is: 45L/min, it should be: 45 L/min. Applies to all work, figures too.

5.       Figure 10 is poor quality and need improvement.

 

6.       The conclusions are modest and should be extended, also with conclusions for further research.

Author Response

1. The analysis of the state of art is modest and does not include many European and world sources, mainly Asian ones. This must be changed, taking into account the works of Mohan Vijay, Josef Foldyna, Sergej Hloch.

Authors reply: Thank you for your valuable feedback. We fully agree with the sound wave excited pulsed water jet technology and its applications studied by European scientists such as the Czech Republic. Our team has frequently cited their published papers in their past papers, and their academic works will also be added to the revised manuscript in the future.

2. The authors presented the aim of the work not very clearly.

Authors reply: I'm very sorry for not clarifying the purpose of this work. The multi pulse characteristics of the pressurized pulsed water jet flow field are important for the mechanism of rock damage caused by the jet. In addition, the adjustment of hydraulic parameters affects this multi pulse characteristic, but the specific impact results are still unknown. Therefore, we will analyze the influence of hydraulic parameters on the flow field characteristics through experiments, and further modify our introduction to ensure that our readers can understand our work objectives.

3. They certainly did not consider specification of the research gap that should be given after analyzing the literature.

Authors reply: Thank you for your suggestion. Pressurized pulsed water jet is a new type of pressurized pulsed water jet technology proposed by our team. Research on pressurized pulsed water jet is still in its infancy, and we will clarify the specific gaps in the introduction.

4. Chapter 2 Experimentation. We put a space between the value and the unit, e.g. it is: 45L/min, it should be: 45 L/min. Applies to all work, figures too.

Authors reply: Thank you for your valuable suggestion. We will review the entire text to ensure that the formatting between our numerical values and unit symbols is correct.

5. Figure 10 is poor quality and need improvement.

Authors reply: Thank you for your suggestion. The original image is relatively clear, but the automatic compression of the file caused the image to be unclear. We will check the quality of all images and replace any images that are poor.

6. The conclusions are modest and should be extended, also with conclusions for further research.

Authors reply: Thank you for your suggestion. We have expanded the conclusion of the article and discussed the prospects for future work.

Reviewer 2 Report

In the paper, the authors explained the influence of hydraulic parameters on the multi-stage pulse characteristics of a pulsating water jet under pressure. They performed experiments varying the initial pressure in the chamber as well as the driving pressure. They observed the first and second pulse of the jet with the help of a high-frequency camera. Some details are given below: Explain figure 4 and 7 with emphasis on a, b and c. Figure 9 clarify the values of t in ms and their selection.
I miss the main conclusion of the article with an emphasis on which parameters are most suitable to apply in a real experiment. Some examples of rock destruction that were analyzed in the introduction.

Author Response

In the paper, the authors explained the influence of hydraulic parameters on the multi-stage pulse characteristics of a pulsating water jet under pressure. They performed experiments varying the initial pressure in the chamber as well as the driving pressure. They observed the first and second pulse of the jet with the help of a high-frequency camera. Some details are given below: Explain figure 4 and 7 with emphasis on a, b and c. Figure 9 clarify the values of t in ms and their selection.
   I miss the main conclusion of the article with an emphasis on which parameters are most suitable to apply in a real experiment. Some examples of rock destruction that were analyzed in the introduction.

Authors' reply: Through experimental research, it was found that the initial pressure directly changes the structural characteristics of the jet, making the flow field structure incoherent, which is conducive to generating water hammer pressure. The driving pressure changes the location and distance of multiple pulses, causing changes in the pulse characteristics of multiple pulses. The research results are conducive to adjusting the optimal pulse position of the jet under different driving pressures.

Reviewer 3 Report

Comments for author File: Comments.pdf

Author Response

1. The abstract should contain an indication of the originality and value of the research. Besides, the second sentence in abstract is very long.

Authors reply: Thank you for your valuable feedback. We have reorganized the abstract to ensure that it highlights the value and significance of our work.

2. The introductory part is rather poorly written. Authors should expand the review of existing literature on the proposed topic.

Authors reply: Thank you for your suggestion. The authors have re edited and added some research results from European scholars to ensure a more complete explanation of the current research status and trends of pulse jet water jet, and to enhance the credibility of the paper review.

 

3. At the end of the introduction, it is crucial for authors to explicitly emphasize the primary contribution of their research. This serves as a concise and compelling summary of the study's unique value and significance within the existing body of literature, which has been discussed earlier in the introduction.

Authors reply: Thank you for your suggestion. We have revised and written the introduction again, summarizing and discussing the research results of scholars. As our pressurized pulsed water jet is a new type of jet, there has been less research on it, so there is less description of the shortcomings of other scholars. We will focus on highlighting its reference significance for the paper.

 

4. Table 1 should be explained in more detail. For example, how the experimental parameters were selected. Whether randomly, based on recommendations, literature, or the capabilities of the machine tool.

Authors reply: Thank you for your suggestion. We will provide a detailed explanation of the basis for selecting experimental parameters.

5. In Section 3.1.1, the parameters used to create Figure 3 and Figure 4 should be explicitly described in the text. In addition, any assertions in the text that are not adequately supported by the existing literature should be addressed and revised. The same applies to the entire chapter 3.1.

Authors reply: Thank you very much for your careful guidance on the article. We have omitted some references, which has caused defects in the article. We will reorganize section 3.1 so that the research results are based on evidence.

6. In the manuscript, it is crucial to explain the statistical methods used to determine the dependencies shown in Figures 15 to 18. In addition, a detailed description of the equations related to the "R" parameter is necessary to give readers a clear understanding of their meaning.

Authors reply: Thank you for your suggestion. We have added a description of the relevant equations in the article.

7. It is important to give a brief introduction to the conclusion section before presenting the main results or summary of the study. In addition, the conclusion section should not only summarize the main points, but also offer insights into future research directions and possible practice applications.

Authors reply: Thank you again for your comprehensive and accurate review. We have written the conclusion section according to your suggestions and academic expression standards, in order to provide reference for the full text and possible practical applications.

Round 2

Reviewer 3 Report

A substantial portion of the images lack clear descriptions. For instance, in Figure 5, segments a and b are presented without corresponding explanations. It would greatly enhance clarity if each image, particularly 5a and 5b, were accompanied by a descriptive label directly embedded within the image itself, or within its caption. Apply this to all images.

Author Response

1. A substantial portion of the images lack clear descriptions. For instance, in Figure 5, segments a and b are presented without corresponding explanations. It would greatly enhance clarity if each image, particularly 5a and 5b, were accompanied by a descriptive label directly embedded within the image itself, or within its caption. Apply this to all images.

Authors reply: Thank you for your detailed feedback. Sorry for not understanding your intention well in the previous reply. We have annotated all classified images to ensure that readers can quickly understand the meaning of the chart. Thank you again for your valuable suggestion.