Analysis of the macrostructure of the fuel spray atomized with marine engine injector

Grochowalska, Joanna

doi:10.19206/ce-2019-413

Cited by 5 publications

(9 citation statements)

References 18 publications

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“…This is caused by the aerodynamic resistance in the constant volume chamber (secondary breakup). The influence of increasing backpressure on reducing the STP was shown in Grochowalska (2019), Payri et al (2017), Wang et al (2016) and Yan et al (2016) and are confirmed by the present results. On the basis of the analysis in Figure 5 and Grochowalska (2019), it may be concluded that an increase of backpressure generally causes a reduction of STP for big nozzles.…”

Section: Resultssupporting

confidence: 90%

“…The formation of cavitation bubbles at the exit of the nozzle may cause greater dissipation and an increase in the value of the SCA (Sou et al , 2007). For Nozzles 2 and 3, there was observed a significant effect of a change in the difference between the pressures on the SCA in time (Grochowalska, 2019). This is related to the formation of large droplets in the fuel spray at the beginning and the aerodynamic resistance in the constant volume chamber.…”

Section: Resultsmentioning

confidence: 99%

“…The influence of increasing backpressure on reducing the STP was shown in Grochowalska ( 2019 2016) and are confirmed by the present results. On the basis of the analysis in Figure 5 and Grochowalska (2019), it may be concluded that an increase of backpressure generally causes a reduction of STP for big nozzles. The reason for this is the formation of large droplets at the exit of the fuel injector nozzle about the big diameter of the outlet nozzle.…”

Section: Spray Tip Penetrationmentioning

confidence: 95%

“…The research was conducted in a constant volume chamber with a quartz window providing 100-mm optical access (Figure 1) (Grochowalska, 2019). The injector used is a conventional pressure-opened diesel injector from a Sulzer Al 25/30 type marine engine equipped with a unit pump injection system.…”

Section: Laboratory Setupmentioning

confidence: 99%

“…The spray inside the chamber was observed by means of the Mie scattering technique (Grochowalska, 2019; Piazzullo et al , 2017). The spray was illuminated in a visible range of wavelengths, as in Zigan et al (2011).…”

Section: Laboratory Setupmentioning

confidence: 99%

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A new model of fuel spray shape at early stage of injection in a marine diesel engine

Grochowalska

Jaworski

Kapusta

et al. 2021

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Purpose In the cylinders of a marine diesel engine, self-ignition occurs in a very short time after the fuel injection into the combustion chamber. Therefore, this paper aims to develop a model of diesel fuel spray for the early stage of fuel spray in the marine diesel engine. The main technical aspects such as nozzle diameter of the marine engine injector and backpressure in the combustion chamber were taken into consideration. Design/methodology/approach In this paper, laboratory experimental studies were carried out to determine parameters of fuel spray in an early stage of injection in the marine diesel engine. The optical measuring Mie scattering technique was used to record the fuel injection process. The working space was a constant volume chamber. The backpressure parameters in the constant volume chamber were the same as during the operation of the marine diesel engine. Based on the experimental studies and important Hiroyasu and Arai models of fuel spray presented in literature was proposed new model of fuel spray parameters for marine diesel injectors. Findings In this paper, the proposed new model of the two main parameters described fuel spray evolution”: new model of spray tip penetration (STP) and spray cone angle (SCA). New model propagation of fuel STP in time was included the influence of nozzle diameter and backpressure. The proposed model has a lower error, about 15%–34%, than the model of Hiroyasu and Arai. Moreover, a new model of the evolution over time of the SCA is developed. Research limitations/implications In the future research of fuel spray process must be taken influence of the fuel temperature. Diesel fuel has a different density and viscosity in dependence of fuel temperature. Therefore are predicted of the expansion about influence of fuel temperature, new model of fuel spray for a marine diesel engine. The main limitations occurring in the research are not possible to carry out the research while real operation marine diesel engine. Originality/value An experimental test was carried out for a real fuel injector of a marine diesel engine. Design parameters and fuel injection parameters were selected on the basis of the actual one. In the literature, SCA is defined as a constant parameter for the specific preliminary data. A new model for the early stage of fuel spray of SCA propagation in time has been proposed. The early stage of fuel spray is especially important, because in this time comes in there to fuel self-ignition.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Spray Tip Penetrationmentioning

confidence: 95%

Section: Laboratory Setupmentioning

confidence: 99%

Section: Laboratory Setupmentioning

confidence: 99%

See 3 more Smart Citations

A new model of fuel spray shape at early stage of injection in a marine diesel engine

Grochowalska

Jaworski

Kapusta

et al. 2021

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Self Cite

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Analysis of the structure of the atomized fuel spray with marine diesel engine injector in the early stage of injection

Grochowalska¹,

Jaworski²,

Kapusta³

2023

Combustion Engines

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This paper presents the results of the experimental research of the atomized fuel spray with the marine diesel engine injector in the constant volume chamber. The specificity of the phenomena occurring in the marine engine cylinder was the reason to use the optical visualisation method in the studies – the Mie scattering technique. This work presents an analysis of the influence of different geometry of outlet orifice and opening pressures of marine diesel injector on the macrostructure of the fuel spray. In the results, it was observed that the increased L/D ratio of the outlet orifice of the injector caused: an increase in the spray cone angle and a decrease in the spray tip penetration in the early stage of injection. Furthermore, it was defined that the characteristic of spray tip penetration over time was power, whereas the spray cone angle over time was a logarithmic function.

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Adoption of the F-statistic of Fisher-Snedecor distribution to analyze importance of impact of modifications of injector opening pressure of a compression ignition engine on specific enthalpy value of exhaust gas flow

Puzdrowska¹

2023

Combustion Engines

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This article analyzes the effect of modifications of injector opening pressure on the operating values of a compression ignition engine, including the temperature of the fumes. A program of experimental investigation is described, considering the available test stand and measurement capabilities. The structure of the test stand on which the experimental measurements were conducted is presented. The method of introducing real modifications of injector opening pressure to the existing test engine was characterized. It was proposed to use F statistic of Fisher-Snedecor (F-S) distribution to evaluate the importance of the impact of modifications of injector opening pressure on the specific enthalpy of the flue gas flow. Qualitative and statistical studies of the results achieved from the measurements were carried out. The specific enthalpy of the fumes for a single cycle of the compression ignition engine, determined from the course of rapidly variable flue gas temperature, was analyzed. The results of these studies are presented and the usable adoption of this type of assessment in parametric diagnosing of compression ignition engines is discussed.

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Analysis of the macrostructure of the fuel spray atomized with marine engine injector

Cited by 5 publications

References 18 publications

A new model of fuel spray shape at early stage of injection in a marine diesel engine

A new model of fuel spray shape at early stage of injection in a marine diesel engine

Analysis of the structure of the atomized fuel spray with marine diesel engine injector in the early stage of injection

Adoption of the F-statistic of Fisher-Snedecor distribution to analyze importance of impact of modifications of injector opening pressure of a compression ignition engine on specific enthalpy value of exhaust gas flow

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