Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads

Xu, Hongming

doi:10.4271/2001-01-1308

Cited by 50 publications

(22 citation statements)

References 9 publications

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“…The difference between the discharge and flow coefficient lies in the definition of the reference area A ref [35]. For the discharge coefficient this area is the valve curtain area and, therefore, it is a linear function of valve lift L v :…”

Section: Discharge and Flow Coefficientsmentioning

confidence: 99%

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

Algieri

2013

IJET

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The work aims at investigating the fluid dynamic performances of a multivalve spark-ignition engine and at evaluating the influence of the throttling process on the engine permeability. To this purpose, a production four-stroke internal combustion engine is analysed during the intake phase. The experimental characterisation is carried out at the steady flow rig in terms of dimensionless discharge and flow coefficients. The global investigation illustrates the noticeable effect of the valve lift on the engine head breathability. Furthermore, the experimental analysis demonstrates that the throttling process has a significant influence on the volumetric efficiency of the intake system and this effect increases with the valve lift. Finally, alternative strategies are studied in order to improve the engine fluid dynamic efficiency at partial loads. Specifically, the research shows that inlet valve deactivation and the adoption of asymmetric intake valve lifts assure an increase in head permeability.

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Section: Discharge and Flow Coefficientsmentioning

confidence: 99%

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

Algieri

2013

IJET

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“…Paddle wheels were installed in the adapters to measure the charge motion revolution. The swirl ratio and tumble ratio were calculated according to AVL system because it is the most popularly used (Xu, 2001). …”

Section: Swirl Generationmentioning

confidence: 99%

Pollutant Emission Reduction and Engine Performance Improvement by Using a Semi-Direct Injection Spark Ignition Engine Fuelled by LPG

Chen

Tran

2012

Aerosol Air Qual. Res.

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Reducing motorcycle exhaust emissions to improve air quality is important in Asia, due to the large number of motorcycles. This study describes and proposes a lean-burn system for reducing pollutant emissions and improving motorcycle engine performance. The lean-burn system, called semi-direct injection (SDI), is comprised of high-swirl charge, injection during intake-valve opening, and liquefied petroleum gas (LPG) injection. A conventional motorcycle engine with port fuel injection (PFI) and spark ignition (SI) was retrofitted by designing a new intake port with a controllable plate to enhance the swirl of intake flow. The swirl ratio was increased to 3.4, enhancing the turbulence of air flow inside the combustion chamber, and the lean limit was extended to 1.7 of relative air/fuel ratio (lambda). The engine was tested at a low-load region which includes most operating points of the ECE-40 driving cycle. A complete engine performance map was produced and a comparison was undertaken between the new design and regular gasoline engines. The results show that brake-specific energy consumption (BSEC) decreased by 19.2%. Brake-specific exhaust emissions of CO 2 , NO x and CO were decreased by 27%, 47% and 94%, respectively. HC emissions were increased by 4.5%.

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“…Detaljan pregled različitih formulacija geometrijskog protočnog preseka i koeficijenta protoka može se naći u literaturi [49,50,86]. Svakako, nisu jednako značajne sve formulacije dostupne u literaturi, niti su kompatibilne sa modelom koji je primenjen u ovom radu.…”

Section: Geometrijski I Efektivni Protočni Presek Ventila -Terminološunclassified

“…Neke od metoda nisu ni namenjene simulaciji trenutnog protoka gasa kroz razvodne organe, već se koriste tokom razvoja cilindarskih glava za procenu srednjeg efektivnog protočnog preseka (npr. metode Ricardo i AVL, Sju [86]). …”

Section: Geometrijski I Efektivni Protočni Presek Ventila -Terminološunclassified

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Dynamic interaction between the structure and the trolley of high performance gantry cranes

Popović¹

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Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads

Cited by 50 publications

References 9 publications

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

Pollutant Emission Reduction and Engine Performance Improvement by Using a Semi-Direct Injection Spark Ignition Engine Fuelled by LPG

Dynamic interaction between the structure and the trolley of high performance gantry cranes

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