The Influence of Mass Composition of Water-Fuel Emulsion on Ecological Characteristics of a Diesel Engine
Round 1
Reviewer 1 Report
1. There are only self-citations in the work. Is there no other work in this area?
2. In Fig. 2 are presented results of water content in emulsion on torque, So, it is visible that with the increase in water fraction torque decreased. It is rather normally. Question is, what was with energy dose of fuel provided to cylinder? It was a constant energy dose?
3. In Fig. 3 are presented concentrations of NOx. These data are misinterpreted. In such a case, as described in the paper, the emission should be given in g/kWh as specific emission. It may turn out that with a high water content in the emulsion, the specific emission of NOx is higher than without water.
4. The results are poorly commented.
Author Response
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Reviewer 2 Report
The article is interesting, but it has many mistakes. The subject of using water in fuel is generally known. The article does not provide relevant information to the current level of science.
The author should take into account the following comments
1. Title too general, My propose: The impact
of fuel on NOx emissions and the noise level of the diesel engine "
2. Introduction - the literature review should be updated. Look for publications in SAE databases. In addition, the literature review lacks alternative solutions for the use of ecological fuels.
3. Methodology - There is no detailed description of the analysis of results and the method of the measurement itself. How the engine performance was performed, whether the measurements were made in accordance with the standards or the own methodology was used.
4. Discussion of research results - Charts are colored, different symbols are used, different lines, I do not understand why the digital links have been added yet? The tests should include the characteristics of fuel consumption and the relation between torque and power. Present the full characteristics of the engine operation. More specifically, please describe the graph of Fig. 1 I do not understand this relationship. There is no explanation as to why the noise level has increased, whether it is due to the characteristics of the fuel burned or the uneven operation of the engine.
5. Applications - smoke opacity was not tested. This information should be included when discussing the results as an observation. No recommendation for the teast results, which contritute to the current state of knowledge.
Author Response
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Reviewer 3 Report
Please expand literature review on the subject of the research. Use a broader list of sources (experiences of different researchers from different countries).
Please provide information on the physico-chemical properties of water-fuel emulsions.
Please expand the information in the section “2. Methods and equipment for the research of water-fuel emulsions“. It should provide information on the WFE preparation technology (58).
Please add more detailed analysis of the results presented in Fig. 1 (67).
More detailed analysis of the indicators is needed (percentage change) (68-69).
Explain how "the average cycle temperature" was found (80).
Explain the term "degrades the working process" (81), “severity of the combustion process” (114).
The water concentration in the fuel affects the power of the engine, so the NOx graphs must be given in g/kWh (83).
Please add and explain "smoke concentration" graphs (87-91).
Changes in the combustion process using WFE should be further explained. It is desirable to provide information about the pressure and the heat release in the cylinder.
In the discussion section, not only the results have to be presented, but also their analysis. Please add deeper results analysis.
Author Response
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Round 2
Reviewer 1 Report
In my opinion, conclusion no. 3 is unnecessary.
Author Response
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Reviewer 3 Report
New sources should prevail in the literature review (not older than 5 years).
Author Response
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