Application of an Imaging-based Diagnostic Technique to Quantify the Fuel Spray Variations in a Direct-Injection Spark-Ignition Engine

Hung, David L.S.; Chmiel, David M.; Markle, Lee E.

doi:10.4271/2003-01-0062

Cited by 22 publications

(10 citation statements)

References 1 publication

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“…However, the levels of RMS in these areas are overall higher. These observations seem to be somewhat in line with the those of Hung et al [9] and Kashdan et al [10], who found the variation in the spray envelope to be independent of the gas pressure for iso-octane pressure-swirl sprays, although the fuel temperature was not varied. Figure 18 for 0.5 bar gas pressure, there is little variation in spray penetration between the fuels.…”

Section: Resultssupporting

confidence: 91%

Effect of Fuel Properties on Spray Development from a Multi-Hole DISI Engine Injector

Romunde¹,

Aleiferis²,

Cracknell³

et al. 2007

SAE Technical Paper Series

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Extensive literature exists on spray development, mixing and combustion regarding engine modeling and diagnostics using single-component and model fuels. However, often the variation in data between different fuels, particularly relating to spray development and its effect on combustion, is neglected or overlooked. By injecting into a quiescent chamber, this work quantifies the differences in spray development from a multi-hole direct-injection spark-ignition engine injector for two single-component fuels (iso-octane and n-pentane), a non-fluorescing multi-component model fuel which may be used for in-cylinder Laser Induced Fluorescence experiments, and several grades of pump gasoline (with and without additives). High-speed recordings of the sprays were made for a range of fuel temperatures and gas pressures. It is shown that a fuel temperature above that of the lowest boiling point fraction of the tested fuel at the given gas pressure causes a convergence of the spray plumes. Increasing the fuel temperature increases this convergence, whilst an associated increased rate of evaporation tends to reduce the penetration of individual plumes. The convergence increases gradually with increasing fuel temperature until all plumes combine to form a single wider plume with a penetration rate greater than that of the individual plumes. When all plumes are converged to form a single plume along a central axis to all the plumes, any further increase in fuel temperature at the given gas pressure acts to increase the rate of evaporation of the fuel. At experiments up to 180 °C fuel temperature and down to 0.3 bar absolute gas pressure, none of the tested fuels were found to spontaneously vaporize; all observed spray formations being a gradual evolution. Increasing the gas pressure at any given fuel temperature, leads to an increase in the boiling temperature of all components of that fuel and, hence, diminishes these effects.

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Section: Resultssupporting

confidence: 91%

Effect of Fuel Properties on Spray Development from a Multi-Hole DISI Engine Injector

Romunde¹,

Aleiferis²,

Cracknell³

et al. 2007

SAE Technical Paper Series

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“…Researchers have developed different techniques to study the cycle-to-cycle variation of fuel spray (Hung et al, 2003;Zhong et al, 2012). Hung et al (2003) presented the presence probability image (PPI) technique to quantify the pulse-to-pulse variation of macroscopic fuel spray geometry for SIDI engine applications.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Cycle-to-Cycle Variations of Pulsing Spray Characteristics by Means of the Proper Orthogonal Decomposition

Chen

Hung

et al. 2013

Atomiz Spr

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This paper presents a novel approach to analyze the cycle-to-cycle variations of pulsing spray characteristics. The purpose is to quantify the cycle-to-cycle variations of the macroscopic characteristics of spark-ignition direct-injection (SIDI) fuel injector spray, so that improvements of air-fuel mixture formation can be made to enhance the combustion efficiency and reduce emissions of SIDI engines. The experiments were carried out using an eight-hole SIDI fuel injector under a controlled ambient environment with an extended range of test conditions. Using a strobe light as an illumination source, multiple cycles of macroscopic spray structure images at a fixed injection delay time were taken by a CCD camera. The proper orthogonal decomposition (POD) technique was implemented to analyze the cycle-to-cycle characteristics of spray variation. In addition, the effects of injection pressure, ambient pressure, and fuel type on spray variation were also investigated. POD analysis reveals that the mode 1 pattern captured the ensemble-averaged spray shape, the mode 2 pattern provided quantification of spatial fuel distribution variations of different cycles of spray, and higher mode patterns further quantified the finer details of the variations surrounding the well-atomized periphery of the spray structure. POD analysis also quantitatively confirms that better-atomized sprays led to slightly higher variations of finer structures along the spray boundary. Overall, this study demonstrates that POD analysis can be used as a novel approach to quantify the cycle-to-cycle variation of pulsing spray characteristics.

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“…The theory of waveform image matching is applied by matching waveform image diagnosed with that in the ignition waveform faults database to find the closest faults waveform image to confirm faults type generated corresponding to ignition fault waveform, as to achieve faults diagnosis purposes by the ignition voltage waveform [7][8][9][10].…”

Section: Waveform Image Matching Algorithmmentioning

confidence: 99%

Research on Modeling and Faults Diagnosis of Aero-engine Ignition System

Xu¹,

Yin²,

Youbin³

2014

TOAUTOCJ

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Aero-engine ignition system, which includes ignition power, ignition exciter, ignition lead and ignition spark plugs, is the core of the engine. The reliability of an ignition system is a key factor whether the engine can run safely and efficiently or not. For improving the safety and continuing airworthiness of the aircraft, it is highly meaningful to do some research on the faults diagnosis of ignition system. This paper mainly focuses on the diagnosis method research and diagnosis system design of aero-engine ignition system faults. In order to cope with this problem, the ignition system mathematical model was designed and with which we can simulate ignition system faults and establish an ignition system theory database. Then experimental system was built to simulate the real ignition system faults to generate ignition system simulation database. Based on the ignition system fault database, the waveform image matching algorithm was used to achieve the real ignition waveform comparison with waveform in faults database. At last, ignition system faults diagnosis system is presented based on diagnostic platform and industrial control computer equipped with high-speed data acquisition card. The analysis result suggests that the ignition system faults diagnosis system can identify typical ignition faults accurately.

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Application of an Imaging-based Diagnostic Technique to Quantify the Fuel Spray Variations in a Direct-Injection Spark-Ignition Engine

Cited by 22 publications

References 1 publication

Effect of Fuel Properties on Spray Development from a Multi-Hole DISI Engine Injector

Effect of Fuel Properties on Spray Development from a Multi-Hole DISI Engine Injector

Analyzing the Cycle-to-Cycle Variations of Pulsing Spray Characteristics by Means of the Proper Orthogonal Decomposition

Research on Modeling and Faults Diagnosis of Aero-engine Ignition System

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