Effects of Pre-Turbocharger Turbine Water Injection on the Sustainable Performance of Spark Ignition Engine

Round 1

Reviewer 1 Report

In this study, engine performance and fuel consumption were investigated by simulation method in the case of spraying water with an injector in the exhaust of a turbocharged spark ignition engine.

1-First of all, the references do not appear properly in the text. This needs to be fixed.

2- What is meant by the "D CFD Simulation Setup" title here.

3-It is stated that the analysis is done in Ansys CFX. Was the analysis two-dimensional or three-dimensional?

4- For the analysis, mesh independence should be achieved first. No images of mesh are provided.

5- CFX study is explained with the Ansys theory guide, and it can be said that it is extended unnecessarily. Here, the boundary conditions used for the analysis should be specified.

6- It can be said that too much information is given while explaining the parameters in the AVL Boost software.

7- It is said that the experiments were carried out with a 1.3 L IAFM engine with a turbocharger, and it is stated that the analysis was made for another 1.6 L engine in the AVL Boost software. There is no information regarding the experimental validation of this study.

8-What is the parameter m in Figure 3?

9- Figures 5,6,7 and 8 should be explained in detail. Generally, the intake valve opening height should be higher than the exhaust. Why is there a reverse situation in this engine so that the engine can absorb air more easily?

10- Explanations should be made by referring to the figures.

11- It would be more appropriate to include numbers instead of e+002 in Figure 15 and other Ansys CFX results.

12- The units of the numbers under the Location of the cross-section in Figure 20 should be written.

13- Fuel consumption is usually expressed as gr/kwh. It is seen that there is no information about engine performance in this study. To understand whether this system affects engine performance, it would be more appropriate to give the fuel consumption as g/kwh instead of kg/hr.

14- It would also be good if information about exhaust emissions could be given. The effect of this system on exhaust emissions is significant. Because the change in emissions is also important due to the sudden reduction of the exhaust temperature.

15-References are useful to refer to very old current literature.

Author Response

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Reviewer 2 Report

General comment: The manuscript "The effects of pre-turbocharger turbine water injection on the performance of a spark ignition engine" has been studied in detail. The manuscript is within the scope of the journal and is of great importance to researchers. In the manuscript, it was understood that a detailed study and research were carried out on the subject. In my opinion, this manuscript can be accepted as a publication in the "Sustainability" journal after Major Revision. After reading the article, the reviewer has the following concerns:

• The article has some minor spelling and grammatical errors. The entire article on this topic should be checked out.

• “Error! Reference source not found.” text is displayed. These errors must be fixed.

• There are many abbreviations, subscripts, and abbreviations in the Greek alphabet, and it is not written what they are. It would be appropriate to write a nomenclature.

• The font size has changed on page 13. This error should be fixed.

• Text alignments on pages 7-9, 12-17, and 19 should be checked.

• References section should be checked for font size.

Author Response

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Author Response File: Author Response.docx

Reviewer 3 Report

This paper investigated the effects of pre-turbocharger turbine water injection on the performance of spark-ignition engine. The attempt is meaningful to the application of pre-turbocharger turbine water injection. However, the study of injection pressure of water, diameter of turbine inlet connecting pipe and injection distance from turbine inlet are meaningless. In other words, only section 3.3 has contribution to scholarship. 

Author Response

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Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

All the comments have been addressed. 

Author Response

Thank you. 

Reviewer 2 Report

All the comments have been addressed. 

Author Response

Thank you.

Author Response File: Author Response.docx

Reviewer 3 Report

1. Sections 2.4 and 2.5 are too lengthy. I suggest the authors delete some of them.

2. 3D CFD model validation and 1D engine model validation should be in section 2.5, not in the Results and Discussion. 

3. Figures 13 and 14 should be deleted. Figure 12 should retain only the validation figures used in Section 3.4.

4. The authors should add the effects of PTWI on emissions in section 3.4.

 

 

Author Response

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Author Response File: Author Response.docx

Round 3

Reviewer 3 Report

Compared with the previous version, this version has no improvement.