A New Methodology for Correcting the Signal Cumulative Phenomenon on Injection Rate Measurements

Payri, Raúl; Salvador, Francisco; Gimeno, J.; Bracho, Gabriela

doi:10.1111/j.1747-1567.2007.00188.x

Cited by 140 publications

(108 citation statements)

References 7 publications

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“…Most important fuel properties are detailed in Table 2. The injector mass flow rate and spray momentum flux were measured at the beginning of this investigation by testing the injection hardware in dedicated test rigs; at a suitable range of operating conditions in terms of injection pressure, injector backpressure and injection duration; following the methodology described in [25,26] using commercial diesel fuel and also the gasoline fuel selected for this research. It was observed that the injection system is able to properly inject gasoline with good performance up to a maximum injection pressure of 1200 bar, from where some internal leakages might start to appear and proper functioning of the injection system cannot be further assured.…”

Section: Engine Architecture and Hardwarementioning

confidence: 99%

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

2014

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Partially Premixed Combustion (PPC) of fuels in the gasoline octane range has proven to combine low NOX and soot emissions with high indicated efficiencies, while still retaining control over combustion phasing with the injection event. Previous research performed in four-stroke engines, has shown how the operating region where gasoline PPC concept can be successfully implemented is largely linked to the octane number of the fuel, making difficult to cover the entire load range with a fixed fuel.In this framework, 2-stroke engines arise as a promising solution to extend the load range of gasoline PPC concept, since it intrinsically provides equivalent torque response with only half the IMEP required in a 4-stroke cycle. Moreover, 2-stroke architecture provides high flexibility on the air management parameters to substantially control the cylinder conditions and affect the combustion environment, allowing proper combustion control even in low load conditions. An experimental investigation has been performed to evaluate the potential of the PPC concept for pollutant control, using a commercial gasoline with Research Octane Number of 95 in a newly-designed 2-stroke poppet valves automotive diesel engine. The experimental results confirm how it is possible to achieve stable gasoline PPC combustion at a low speed medium load point (1200 rpm, 5 bar IMEP); with good combustion stability (σIMEP below 3%), high combustion efficiency (over 98%), and low NOX and zero soot levels; thanks to the wide control of the cylinder gas temperature provided by the air management settings. Nevertheless, in agreement to the results reported in the literature, the indicated cycle efficiency attained at this low load operating condition is lower than the obtained in conventional diesel combustion conditions. Therefore, a dedicated optimization process of the engine hardware and engine settings is required to fully exploit the benefits of gasoline PPC concept in the investigated 2-stroke engine architecture.

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Section: Engine Architecture and Hardwarementioning

confidence: 99%

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

2014

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“…The injection rate measurements were carried out in a standard injection rate discharge curve indicator based in the Bosch method (anechoic tub), described in [28]. In order to obtain a good estimation of the experimental errors, several repetitive measurements were carried out at the same test point (energizing time, rail pressure, and backpressure).…”

Section: Injection Rate Meter and Spray Momentum Test Rigmentioning

confidence: 99%

Influence of injector technology on injection and combustion development – Part 1: Hydraulic characterization

et al. 2011

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An experimental study of two real multi-hole Diesel injectors is performed under current DI Diesel engine operating conditions. The aim of the investigation is to study the influence of injector technology on the flow at the nozzle exit and to analyse its effect on the spray in evaporative conditions and combustion development. The injectors used are two of the most common technologies used nowadays: solenoid and piezoelectric. The nozzle for both injectors is very similar since the objective of the work is the understanding of the influence of the injector technology on spray characteristics for a given nozzle geometry. In the first part of the study, experimental measurements of hydraulic characterization have been analyzed for both systems. Analysis of spray behavior in evaporative conditions and combustion development will be carried out in the second part of the work. Important differences between both injectors have been observed, especially in their transient opening and closing of the needle, leading to a more efficient air-fuel mixing and combustion processes for the piezoelectric actuated injector.

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“…Mirko Bartatta [6] showed that fluctuations of the fuel injection quantities could be decreased by using an optimum length-diameter ratio of fuel pipe, and Bianchi G M et al [7] also demonstrated that the variations of the fuel injection quantities could be reduced by utlizing a short fuel pipe with large inner diameter. As reported in the reference [8], the influence of cavitation in the fuel pipe on the injection pressure and the injection rate was established together with and a validated measuring method for fuel injection rate.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

Luo

Wang

Xue

et al. 2016

MATEC Web of Conferences

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Abstract. The inner diameter of high pressure fuel pipe has a significant effect on the fuel injection process and the performance of a diesel engine. The spray impact force of each nozzle hole of a conventional injection system of pump-line-nozzle for diesel engine (based on the spray momentum flux) and the injection pressure (on a fuel injection pump test rig) were measured. With varying fuel injection quantities and pump speed, the effects of the inner diameter of the high pressure fuel pipe on fuel injection process and the fuel injection characteristics of each nozzle hole were analyzed. It was noted from experimental results that the fuel injection pressure changes with variations in the inner diameter of the high pressure fuel pipe and also the injection duration gradually increases with increase in the inner diameter. .At low injection pump speed, even with the same geometric fuel deliver rate, the injection duration also increases gradually. Due to throttling effect and reduction in injection pressure, the fuel injection quantities of the injection nozzle were relatively minimal when the inner diameters of the high pressure fuel pipe were respectively small and large. The optimum injection pipe inner diameter for the right quantity for fuel injection falls between the two cases (between small and large). In addition, the injection rate of each nozzle hole increases with the decrease in angle between the needle axis and each of the nozzle hole axis. The fuel injection quantity of each nozzle hole increases while their relative difference decreases with increasing pump speed.

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A New Methodology for Correcting the Signal Cumulative Phenomenon on Injection Rate Measurements

Cited by 140 publications

References 7 publications

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

Implementation of the Partially Premixed Combustion concept in a 2-stroke HSDI diesel engine fueled with gasoline

Influence of injector technology on injection and combustion development – Part 1: Hydraulic characterization

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

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