Wszystkie pola: knock onset prediction - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation of knock suppression characteristics in a boosted methane : gasoline blended fuelled SI engine
Autorzy:: Yang, Z.
Miganakallu, N.
Rao, S.
Harsulkar, J.
Naber, J.
Lonari, Y.
Szwaja, S.
Powiązania:: https://bibliotekanauki.pl/articles/244629.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: knock
methane
gasoline
E10
blend fuel
knock onset prediction
simulation
Opis:: Natural gas has a higher knock suppression effect than gasoline which makes it possible to operate at higher compression ratio and higher loads resulting in increased thermal efficiency in a spark ignition engine However, using port fuel injected natural gas instead of gasoline reduces the volumetric efficiency from the standpoints of the charge displacement of the gaseous fuel and the charge cooling that occurs from liquid fuels. This article investigates the combustion and engine performance characteristics by utilizing experimental and simulation methods varying the natural gas-gasoline blending ratio at constant engine speed, load, and knock level. The experimental tests were conducted on a single cylinder prototype spark ignited engine equipped with two fuel systems: (i) a Direct Injection system for gasoline and (ii) a Port Fuel Injection (PFI) system for compressed natural gas. For the fuels, gasoline with 10% ethanol by volume (commercially known as E10) with a research octane number of 91.7 is used for gasoline via the DI system, while methane is injected through PFI system. The knock suppression tests were conducted at 1500 rpm, 12 bar net indicated mean effective pressure wherein the engine was boosted using compressed air. At 60% of blending methane with E10 gasoline, the results show high knock suppression. The net indicated specific fuel consumption is 7% lower, but the volumetric efficiency is 7% lower compared to E10 gasoline only condition. A knock prediction model was calibrated in the 1-D simulation software GT-Power by Gamma Technologies. The calibration was conducted by correlating the simulated engine knock onset with the experimental results. The simulation results show its capability to predict knock onset at various fuel blending ratios.
Źródło:: Journal of KONES; 2018, 25, 3; 517-525
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The onset of knock in gas fuelled spark ignition engines prediction and experiment
Autorzy:: Karim, G. A.
Powiązania:: https://bibliotekanauki.pl/articles/244289.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
gas engine modelling
engine performance knock criterion
Opis:: An approach for predicting the onset of knock and estimating its intensity in spark ignition engines is described. It is based on evaluating a dimensionless energy functional group, Kn, formulated to provide a numerical criterion to test continually, while using predictive models of the performance of spark ignition engines, for the onset of knock and its relative intensity at any instant during the combustion process. The basis for the derivation of this knock criterion and its significance are described. Examples involving gaseous fuels and their mixtures under different operating conditions show how the criterion can be employed for the prediction of the onset of knock and the associated knock-limited performance. It is shown that this approach can be made an integral part of modeling spark ignition engine operation to be used for optimizing engine performance while ensuring throughout the avoidance of the onset of knock. Among other things variations relative energy release and end gas mass fraction during flame propagation for non-knocking and border line knocking conditions, variations in the calculated knock criterion value with time for knock free, light and heavy knocking conditions, with compression ratio for hydrogen and methane as a fuel CFR engine, calculated optimum spark timing maximum power variation the probability of the incidence of knock versus spark timing, the suppression of the onset of knock through lean operation or cooled EGR are illustrated in the paper.
Źródło:: Journal of KONES; 2007, 14, 4; 165-175
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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