Effects of injector leakage on liquid propane injection engine performance

2005 ◽  
Vol 219 (4) ◽  
pp. 559-564
Author(s):  
Gyeung Ho Choi ◽  
Seong Keun Shin ◽  
Seok Choun Bae ◽  
Yong Jong Chung ◽  
Sung Bin Han
Keyword(s):  
Critical Point ◽  
Performance Improvement ◽  
Engine Speed ◽  
Technical Information ◽  
Engine Performance ◽  
Liquefied Petroleum Gas ◽  
Liquid Propane ◽  
Starting Time ◽  
Unburned Hydrocarbon ◽  
Small Leak

This study aims to provide basic technical information for research regarding starting performance improvement by using a 2.656 cm3 V6 liquid propane injection engine to study the effects of varying the liquefied petroleum gas (LPG) leakage on starting performance and to analyse the effects of such leakage on emission characteristics. To determine the LPG injection amount that corresponds to the desired LPG leakage, 1–30 l was injected to find the critical point and, since the injected fuel was detected at the intake starting from 5.5 l, starting performance comparisons of engine speed and exhaust gases were made at 0 l, 1 l, 2 l, 3 l, 4 l, 5 l, and 6 l by measuring the desired value five times and taking the average. Also, to study the effects of a small leak, the starting performance was tested while injecting 0 l, 0.2 l, 0.4 l, 0.6 l, 0.8 l, and 1 l. The major conclusions of this work are as follows: The results of determining the critical point of starting delay for LPG leakages of 1–30 l show that the critical point is 21 l and 14 cycles. For LPG leakages of 1–6 l, the starting time and unburned hydrocarbon (HC) increases with increasing LPG leakage. At LPG leakage of 0.2 l, the starting time is much faster at 1 cycle, but unburned HC increases with increasing LPG leakage.

Vibration Spectra as a Feedback for Controlling Multicylinder Engine Performance

1992 ◽  
Vol 3 (2) ◽  
pp. 176-192
Author(s):  
T.W. Abou-Arab ◽  
M. Othman ◽  
Y.S.H. Najjar
Keyword(s):  
Engine Speed ◽  
Engine Performance ◽  
Feedback System ◽  
Operating Conditions ◽  
Flow Induced Vibration ◽  
Vibration Spectra ◽  
Parametric Studies ◽  
Vibration Pattern ◽  
Engine Components ◽  
Heat And Fluid Flow

Increasing requirements for vehicle confort, economy and reliability lead some investigators to consider the relationships between the mechanical vibrations with the heat and fluid flow induced vibration and noise in a more accurate manner. This paper describes the variation of the vibration phenomena associated with the motion of some engine components under different operating conditions. The measured vibration spectra indicates its capability in predicting symptoms of early engine failures, hence, expediting their control using a suitable feedback system. Parametric studies involving the effect of air-fuel ratio, ignition timing and engine speed on the vibration pattern are also carried out. These studies indicate that the amplitude of vibration decreases as the speed increases then increases again after certain engine speed. The effect of ignition system characteristic on the induced vibration are obtained and the correlation between the developed power and the engine dynamics over a range of operating conditions are discussed.

scholarly journals Engine Performance of a Gardener Compression Ignition Engine using Rapeseed Methyl Esther

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Hamisu A Dandajeh ◽  
Talib O Ahmadu
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Equivalence Ratio ◽  
Engine Speed ◽  
Engine Performance ◽  
Combustion Characteristics ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Air Mass

This paper presents an experimental investigation on the influence of engine speed on the combustion characteristics of a Gardener compression ignition engine fueled with rapeseed methyl esther (RME). The engine has a maximum power of 14.4 kW and maximum speed of 1500 rpm. The experiment was carried out at speeds of 750 and 1250 rpm under loads of 4, 8, 12, 16 and 18 kg. Variations of cylinder pressure with crank angle degrees and cylinder volume have been examined. It was found that RME demonstrated short ignition delay primarily due to its high cetane number and leaner fuel properties (equivalence ratio (φ) = 0.22 at 4kg). An increase in thermal efficiency but decrease in volumetric efficiency was recorded due to increased brake loads. Variations in fuel mass flow rate, air mass flow rate, exhaust gas temperatures and equivalence ratio with respect to brake mean effective pressure at engine speeds of 750 and 1250 rpm were also demonstrated in this paper. Higher engine speed of 1250 rpm resulted in higher fuel and air mass flow rates, exhaust temperature, brake power and equivalent ratio but lower volumetric efficiency. Keywords— combustion characteristics, engine performance, engine speed, rapeseed methyl Esther

Diesel Engine Performance Improvement for Constant Speed Application Using CFD

2017 ◽  
Author(s):  
Balasaheb S. Dahifale ◽  
Anand S. Patil
Keyword(s):  
Combustion Chamber ◽  
Fuel Consumption ◽  
Performance Improvement ◽  
Test Data ◽  
Engine Performance ◽  
Exhaust Valve ◽  
Fine Tuning ◽  
Intake Valve ◽  
Valve Seat ◽  
Load Conditions

The detailed investigation of flow behavior inside the combustion chamber and performance of engine is most challenging problem due to constraints in Experimental Data collection during testing; However, Experimental testing is essential for establishment of correlation with CFD Predictions. Hence, the baseline engine was tested at different load conditions and validated with CFD results, before it was optimized for performance improvement. The objective of the CFD Prediction was not only to optimize performance (Fuel Efficiency, Power, Torque, etc.) & Emissions Reduction, but also to assess feasibility of Performance Upgrade Potential. In the present CFD study, surface mesh and domain was prepared for the flame face, intake valve, intake valve seat, exhaust valve, exhaust valve seat and liner for closed volume cycle, between IVC and EVO using CFD code VECTIS. Finally simulations for three different load conditions were conducted using VECTIS solver. Initially, in-cylinder pressure vis a vis crank angle prediction was carried out for 100%, 75% and 50% load conditions. Then the fine tuning of (P-ϴ) diagram for different load conditions was conducted by varying different combustion parameters. Further, the engine performance validation was carried out for rated and part load conditions in terms of, IMEP, BMEP, break specific fuel consumption and power output, while NOx mass fractions were used to convert the NOx to g/kWh for comparison of emission levels with the test data. Finally optimized re-entrant combustion chamber and modified valve timing with optimum fuel injection system simulation was carried out to achieve target performance with reduced fuel consumption. A 3D CFD result showed reduction in BSFC and was in close agreement with the test data.

Performance Improvement of a Domestic Liquefied Petroleum Gas Cook Stove Using an Extended Spill-Tray and an Annular Metal Insert

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Mithun Das ◽  
Ranjan Ganguly ◽  
Amitava Datta ◽  
Meenam M. Verma ◽  
Ashis K. Bera
Keyword(s):  
Performance Improvement ◽  
Thermal Efficiency ◽  
Transfer Rate ◽  
Energy Content ◽  
Metal Plate ◽  
Liquefied Petroleum Gas ◽  
Transport Parameters ◽  
Species Transport ◽  
Secondary Air ◽  
Cook Stoves

Abstract Liquefied petroleum gas (LPG) is widely used as a cooking fuel as it has higher energy content and produces lower emissions compared to other traditional fuels. Due to massive demand for LPG, aside from its limited reserve, performance improvement of the LPG cook-stoves is essential. In the present work, the thermal efficiency of a traditional cook stove has been studied both experimentally and numerically for LPG fuel. Based on the knowledge from the computational model concerning flow field and species transport parameters, the conventional cook-stove design has been modified for improving the efficiency. In the modified design of the stove, attachment of an annular metal plate insert and introduction of an extended spill-tray to close the gap around the burner are considered. The modifications result in favourable guidance of the flow of secondary air and hot product gases of combustion to ensure better heat transfer rate to the loading vessel. The thermal efficiency of the modified cook-stove is around 73.6%, which is about 4.7 percentage point improvement from that of an identical stove without the insert and extended spill-try.

Measurements of Laminar Flame Speeds of Alternative Gaseous Fuel Mixtures

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Ahmed S. Ibrahim ◽  
Samer F. Ahmed
Keyword(s):  
Carbon Dioxide ◽  
Alternative Fuels ◽  
Laminar Flame ◽  
Engine Performance ◽  
Fuel Mixture ◽  
Gaseous Fuel ◽  
Combustion Engines ◽  
Liquefied Petroleum Gas ◽  
Ambient Conditions ◽  
Fuel Mixtures

Global warming and the ever increasing emission levels of combustion engines have forced the engine manufacturers to look for alternative fuels for high engine performance and low emissions. Gaseous fuel mixtures such as biogas, syngas, and liquefied petroleum gas (LPG) are new alternative fuels that have great potential to be used with combustion engines. In the present work, laminar flame speeds (SL) of alternative fuel mixtures, mainly LPG (60% butane, 20% isobutane, and 20% propane) and methane have been studies using the tube method at ambient conditions. In addition, the effect of adding other fuels and gases such as hydrogen, oxygen, carbon dioxide, and nitrogen on SL has also been investigated. The results show that any change in the fuel mixture composition directly affects SL. Measurements of SL of CH4/LPG–air mixtures have found to be about 56 cm/s at ø = 1.1 with 60% LPG in the mixture, which is higher than SL of both pure fuels at the same ø. Moreover, the addition of H2 and O2 to the fuel mixtures increases SL notably, while the addition of CO2/N2 mixture to the fuel mixture, to simulate the EGR effect, decreases SL of CH4/LPG–air mixtures.

Performance and Emissions Characteristics of Diesel Engine Fuelled by Biodiesel Derived from Palm Oil

2013 ◽  
Vol 315 ◽  
pp. 517-522 ◽  
Author(s):  
Amir Khalid ◽  
Shahrul Azmir Osman ◽  
M. Norrizam Mohamad Jaat ◽  
Norrizal Mustaffa ◽  
Siti Mariam Basharie ◽  
...  
Keyword(s):  
Palm Oil ◽  
Engine Speed ◽  
Oxidation Stability ◽  
Combustion Process ◽  
Engine Performance ◽  
Load Test ◽  
Emission Regulations ◽  
Oxygenated Fuel ◽  
Performance And Emissions ◽  
Hc Emissions

Bio fuels based on vegetable oils offer the advantage being a sustainable, annually renewable source of automobile fuel. Despite years of improvement attempts, the key issue in using vegetable oil-based fuels is oxidation stability, stoichiometric point, bio-fuel composition, antioxidants on the degradation and much oxygen with comparing to diesel gas oil. Thus, the improvement of emissions exhausted from diesel engines fueled by biodiesel derived from palm oil is urgently required to meet the future stringent emission regulations. Purpose of this study is to explore how significant the effects of palm oil blending ratio on combustion process that strongly affects the vehicles performance and exhaust emissions. The engine speed was varied from 15003000 rpm, load test condition varied by Dynapack chassis dynamometer from 050% and palm oil blending ratio from 515vol% (B5B15). Increased blends of biodiesel ratio is found to enhance the combustion process, resulting in decreased the HC emissions with nearly equal of engine performance. The improvement of combustion process is expected to be strongly influenced by oxygenated fuel in biodiesel content.

scholarly journals Torque and Power Characteristics of Single Piston LPG-Fueled Engines on Variations of Ignition Timing

2019 ◽  
Vol 2 (1) ◽  
pp. 22-27 ◽  
Author(s):  
Bagiyo Condro Purnomo ◽  
Noto Widodo
Keyword(s):  
Engine Performance ◽  
Alternative Fuel ◽  
Spark Ignition ◽  
Liquefied Petroleum Gas ◽  
Ignition Timing ◽  
Si Engine ◽  
Optimum Performance ◽  
Power Characteristics

Liquefied Petroleum Gas (LPG) is an alternative fuel that has all key properties for the Spark Ignition (SI) engine. However, because of its properties, ignition timing on an LPG SI engine needs to be advanced from the reference angle to get the optimum performance. Therefore, this article presents the torque and power characteristics of a single piston LPG engine on variations of ignition timing. Evaluation of engine performance is carried out at the ignition timing of 15O, 17O, and 19O BTDC. The results showed the highest torque for LPG fuel was 10.64 Nm which was achieved at 3500 rpm with ignition timing of 19O BTDC, while the highest power for LPG fuel was 6.9 hp which was achieved at 5936 rpm with ignition timing of 19O BTDC.

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