Experimental investigation of infrared signal characteristics in a micro-turbojet engine

2019 ◽  
Vol 123 (1261) ◽  
pp. 340-355 ◽  
Author(s):  
S. M. Choi ◽  
S. Kim ◽  
R. S. Myong ◽  
W. Kim
Keyword(s):  
Temperature Distribution ◽  
Aspect Ratio ◽  
Fuel Consumption ◽  
Engine Performance ◽  
Gas Temperature ◽  
Fuel Consumption Rate ◽  
Aspect Ratios ◽  
Turbojet Engine ◽  
Signal Characteristics ◽  
Cone Type

ABSTRACTInfrared signal measurements from a micro-turbojet engine are conducted to understand the characteristics of the engine performance and the infrared signal by varying the exhaust nozzle configuration. A cone type nozzle and five rectangle type nozzles whose aspect ratios vary from one to five are used for this experimental work. As a result, it is confirmed that the thrust and the fuel consumption rate of the engine do not change greatly by varying the exhaust nozzle shape. In the case of the aspect ratio of 5, the specific fuel consumption of the engine is increased by about 3% compared to the reference cone nozzle, but the infrared signal can be reduced by up to 14%. As a result of measuring the temperature distribution of the plume gas, the correlation of infrared signal with plume gas temperature distribution can be understood. In the case of a cone shape, the distribution of plume gas formed to circular shape, and the high-temperature core region of plume gas continued to develop farther to the downstream. However, the temperature distribution was maintained in the rectangular shape as the aspect ratio increased, and the average temperature decreased sharply. As the aspect ratio increases, the plume spreads more widely.

scholarly journals Experimental Study on the Cyclic Performance of Reinforced Concrete Shear Walls Exposed to Fire

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Eunmi Ryu ◽  
Heesun Kim ◽  
Yeongsoo Shin
Keyword(s):  
Temperature Distribution ◽  
Aspect Ratio ◽  
Failure Mode ◽  
Failure Modes ◽  
Shear Walls ◽  
Lateral Loads ◽  
Cyclic Performance ◽  
Concrete Wall ◽  
Aspect Ratios ◽  
Heated Area

AbstractThe purpose of this study was to investigate the thermal and cyclic behaviors of fire-damaged walls designed with different failure modes, aspect ratios and heated areas. These cyclic behaviors include temperature distribution, maximum lateral load, stiffness, ductility, and energy dissipations, etc. Toward this goal, the concrete wall specimens were exposed to heat following an ISO 834 standard time–temperature curve and the cyclic loading was applied to the fire-damaged walls. The test results showed that exposure to fire significantly reduced the cyclic performance of the RC walls. Especially, it was observed that heated area, designed failure mode, and aspect ratio have influences on maximum lateral loads, stiffness, and ductility of the fire-damaged walls, while almost no effects of the heated area, designed failure mode, and aspect ratio on temperature distribution and energy dissipation were found.

Research on the Combustion Characteristics of Small-Scaled Ethanol Pool Fire of Different Aspect Ratios

2011 ◽  
Vol 347-353 ◽  
pp. 1161-1165
Author(s):  
Cui Peng Kuang ◽  
Yuan Zhou Li ◽  
Shi Zhu ◽  
Shao Hua Mao
Keyword(s):  
Temperature Distribution ◽  
Aspect Ratio ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Pool Fire ◽  
Aspect Ratios ◽  
Fire Experiment ◽  
The Difference ◽  
Experimental Values ◽  
Centerline Temperature

Four groups of small-scaled ethanol pool fire experiment with different aspect-ratio(s) is undertaken, to gauge the mass loss rate of fuel as well as the plume centerline temperature distribution. Comparison of plume centerline temperature is made between the theoretical values estimated by Heskestad plume model and experimental results, which indicates that: with the increasing of s, the difference between theoretical values and experimental values tend to grow greater; and when s≈1, theoretical values and experimental values cohere well.

Comparative analysis of engine running performance with and without thermostat

2021 ◽  
Vol 4 (1) ◽  
pp. 047-053
Author(s):  
Albert K. Arkoh ◽  
Esther B. Kyere ◽  
Isaac Edunyah
Keyword(s):  
Fuel Consumption ◽  
Statistical Significance ◽  
Engine Performance ◽  
Exhaust Emissions ◽  
Exhaust Emission ◽  
Gas Temperature ◽  
Ic Engine ◽  
Mean Values ◽  
Significant Difference ◽  
Engine Condition

The rate of removal of internal combustion (IC) engine thermostat when engines are imported to Ghana and other part of African continent is alarming. Such phenomenon calls for an experiment to compare the performance of IC engines imported here in Ghana running with and without engine thermostat. The analysis was done by determine engine performance characteristic such as engine torque, indicated power (Ip), brake power (bp), frictional power (fp), fuel consumption, exhaust gas temperature (EGT) as well as exhaust emission at engine speed of 1500 rpm for engine running with thermostat (WT) and without thermostat (WOT). Descriptive statistics and analysis of variance (ANOVA) were done using GenStat software (VSN International, 2021). Statistical significance was carried out at p≤0.05. The best fuel mean value of 103 ml was recorded for engine condition WT at EGT of 283.2 °C while fuel consumed for engine condition WOT was 170 ml at EGT of 155.4 °C. The recorded mean exhaust emission gases for Ex, O2, CO, H2S were 13.2%, 16.2%, 1000 ppm and 35.2 ppm and 0%, 18.38%, 393.2 ppm and 0.4 ppm for engine condition WOT and WT respectively. There was significant difference (p≤0.05) in mean values of EGT, Fuel consumption and exhaust emissions for engine condition WOT with the exception of O2. The removal of engine thermostat affect engine working temperature which result in incomplete combustion, high fuel consumption and high exhaust emissions.

Influence of Bioethanol-Gasoline Blended Fuel on Performance and Emissions Characteristics from Port Injection Sinjai Engine 650 cc

2014 ◽  
Vol 493 ◽  
pp. 273-280 ◽  
Author(s):  
Bambang Sudarmanta ◽  
Sudjud Darsopuspito ◽  
Djoko Sungkono
Keyword(s):  
Fuel Consumption ◽  
Engine Performance ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Performance And Emissions ◽  
Blended Fuel ◽  
Hc Emissions ◽  
American Society ◽  
Exhaust Gas Temperature ◽  
Blended Fuels

Performance and emissions characteristics from port injection SINJAI engine 650 cc operating on bioethanol-gasoline blended fuels of 0%, 5%, 10%, 15% and 20% were investigated on water brake dynamometers with power capacity 120 hp. The properties of bioethanol were measured based on American Society for Testing Materials (ASTM) standards. Fuel consumption was measured by the time fuel consumption per 25 cc of fuel in a measuring glass whereas combustion air consumption was measured using an air flow meter. The emission parameters, exhaust gas temperature and air fuel ratio were measured using STARGAS exhaust gas analyzer. The increase of bioethanol content will increases the engine performance and reduces pollutan emission. The highest engine performance produced by E15 blended fuel with increased torsi, mean effective pressure and power output of 10,27 %, thermal efficiency 1,8% but specific fuel consumption increased approximatelly 12,42%. This condition occurs at engine speed 3000 - 3500 rpm. While the emission CO and HC emissions decreased significantly as a result of the leaning effect caused by the bioethanol addition. In this study, it was found that using bioetanol-gasoline blended fuels , the CO and HC emissions would be reduced appoximatelly by 55 and 32% Respectively.

Effects of Biodiesel Derived by Waste Cooking Oil on Fuel Consumption and Performance of Diesel Engine

2014 ◽  
Vol 554 ◽  
pp. 520-525 ◽  
Author(s):  
Amir Khalid ◽  
Azim Mudin ◽  
M. Jaat ◽  
Norrizal Mustaffa ◽  
Bukhari Manshoor ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Diesel Fuel ◽  
Engine Speed ◽  
Load Condition ◽  
Engine Performance ◽  
Waste Cooking Oil ◽  
Load Test ◽  
Animal Fats ◽  
Cooking Oil ◽  
Fuel Consumption Rate

Biodiesel is the alternate fuel which is derived from renewable sources either is vegetable oils or animal fats. For that reason, the vehicle run by Bio-diesel Fuel (BDF) has been a potential option and the alternative sources of fuel are receiving a lot attention in the automotive industry. The use waste cooking oil (WCO) biodiesel as an alternative fuel in engines has advantages from both economic and the emissions of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas. Purpose of this study is to investigate the effects of waste cooking oil blended fuel, engine speed and test load conditions on the fuel properties, combustion characteristics and engine performance. The engine speed was varied from 1500 to 3000 rpm, load test condition varied by dynapack chassis dynamometer in 0, 50 and 100% and blends of 5(WCO5), 10(WCO10) and 15vol%(WCO15) waste cooking oil with the diesel fuel. The results showed that the use of WCO as biodiesel results in a higher fuel consumption rate, especially at low engine speed and full load condition.

End Effects on H2-Forced Convection in Rectangular Ducts of Large Aspect Ratios

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
C. Y. Wang
Keyword(s):  
Nusselt Number ◽  
Temperature Distribution ◽  
Aspect Ratio ◽  
Forced Convection ◽  
Large Aspect Ratio ◽  
Rectangular Duct ◽  
End Effects ◽  
Heat Addition ◽  
Aspect Ratios

The H2-forced convection in a rectangular duct of large aspect ratio (>10) is studied. It is found that the short ends have non-negligible effects on the Nusselt number and the temperature distribution. Even at infinite aspect ratios, the Nusselt number depends on the net heat addition from the ends, but not how they are distributed.

scholarly journals Effect of Waste Plastic Oil on Engine Performance and Durability

2021 ◽  
Vol 58 (1) ◽  
pp. 1655-1659
Author(s):  
Khongdet Phasinam, Thanwamas Kassanuk
Keyword(s):  
Fuel Consumption ◽  
Diesel Fuel ◽  
Alternative Energy ◽  
Performance Test ◽  
Engine Performance ◽  
Wear Test ◽  
Waste Plastic ◽  
Fuel Consumption Rate ◽  
Waste Plastic Oil ◽  
Plastic Wastes

Thailand has had the policies supporting the production and uses of renewable and alternative energies in order to reduce the imports of the fuels from other countries. Producing the fuels from plastic wastes can lower the pollution and energy problems in the country in order to ensure that the fuels can actually be the alternatives. The purpose of this research study is to compare the effects of using the diesel fuel from the plastic wastes on the single cylinder engines by comparing the performances and wears of the engines with the commercial diesel fuel and waste plastic oil. There were two tests: 1) the engine performance test and 2) the engine wear test. According to the results of the engine performance test, it was found that the waste plastic oil resulted in the torque and brake power lower than those of the commercial diesel fuel for about 3% at 2,200 revolutions per minute. However, the waste plastic oil had the lower fuel consumption rate than that of the commercial diesel fuel. As a result, the waste plastic oil had the specific fuel consumption that was lower than that of the commercial diesel fuel for about 2%. Regarding the engine wears, it was found that the waste plastic oil caused slightly more wears than the commercial diesel fuel. It was concluded that the waste plastic oil was an alternative energy that had the potentials of the commercial diesel fuel without modifying the engines.

The Performance of a Common Rail Diesel Engine Fueled with Different Blending Ratio of Biodiesels at Different Altitudes

2013 ◽  
Vol 860-863 ◽  
pp. 1685-1689
Author(s):  
Ze Fei Tan ◽  
Li Zhong Shen ◽  
De Cai Jin ◽  
Yang Wen Bin Ou
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Fuel Consumption ◽  
Engine Performance ◽  
Common Rail ◽  
Specific Fuel Consumption ◽  
Brake Specific Fuel Consumption ◽  
Gas Temperature ◽  
Engine Power ◽  
High Pressure Common Rail

To study the effect of the biodiesel on the performance of the high pressure common rail diesel engine performance, a experiment is conducted about the high pressure common rail diesel engine uses diesel fuel and different blending ratio of biodiesels. The results show that with the rising of the altitude, the engine power and the brake specific fuel consumption reduce, exhaust gas temperature increases; At the same altitude, the engine fueled with different blending ratio of bio-diesel has higher brake specific fuel consumption in comparison with fueled engine, but it has lower power, with the increase in bio-diesel blending ratio, engine power, fuel consumption increase.

scholarly journals Performance evaluation of a Compression Ignition Engine using Sand Apple (Parinari polyandra B.) ethyl ester (biodiesel)

2021 ◽  
Vol 40 (2) ◽  
pp. 348-356
Author(s):  
A. Saleh ◽  
F.B. Akande ◽  
D.T. Adeyemi ◽  
O.O. Oniya
Keyword(s):  
Diesel Engine ◽  
Ethyl Ester ◽  
Engine Performance ◽  
Ethyl Esters ◽  
Compression Ignition ◽  
Gas Oil ◽  
Gas Temperature ◽  
Compression Ignition Engine ◽  
Transportation Fuels ◽  
Fuel Consumption Rate

The quest for non-edible oil for the production of alternative fuel (bio-fuel) using homogeneous catalysts continues to supplement and replace in totality the traditional transportation fuels that are not environmentally friendly. The use of biodiesel in Compression Ignition Engines (CIE) to evaluate the engine performance is a norm and blends of biodiesel and Automotive Gas Oil (AGO) are also used in the engine performance processes to ascertain its usage in the CIE. Therefore, this study evaluated the performance of a compression-ignition engine (CIE) fuelled with biodiesel produced from sand apple oil using eggshell as a heterogeneous catalyst. Transesterification of Sand Apple Oil (SAO) with ethanol to produce ethyl ester and glycerol was optimized. Sand Apple Ethyl Esters (SAEE) was blended with Automotive Gas Oil (AGO) at 5 – 25% mix to evaluate the performance of a 3.68 kW diesel engine at five loading conditions (0, 25. 50, 75, 100%). Performance tests were carried out to determine torque, speed, exhaust gas temperature and fuel consumption rate. Data obtained were analyzed using ANOVA at P < 0.05 significant level. Results of parameters tested ranged from 6.50 – 6.60 Nm, 2795 – 2950 rpm, 385 – 400 °C and 2.93 – 5.00 × 10−6 kg/s, respectively for all the blends. The study established that the performance of the diesel engine using 5 – 25% SAEE-AGO blends was similar to using AGO alone and SAEE is therefore suitable for use in the CIE.

Application of Box-Behnken Analysis on the Optimisation of Air Intake System for a Naturally Aspirated Engine

2020 ◽  
Vol 17 (2) ◽  
pp. 8029-8042
Author(s):  
N.S. Mustafa ◽  
N.H.A. Ngadiman ◽  
M.A. Abas ◽  
M.Y. Noordin
Keyword(s):  
Fuel Consumption ◽  
Fuel Efficiency ◽  
Engine Performance ◽  
Fuel Price ◽  
Design Expert ◽  
Intake System ◽  
Analysis Technique ◽  
System Components ◽  
Air Intake ◽  
High Influence

Fuel price crisis has caused people to demand a car that is having a low fuel consumption without compromising the engine performance. Designing a naturally aspirated engine which can enhance engine performance and fuel efficiency requires optimisation processes on air intake system components. Hence, this study intends to carry out the optimisation process on the air intake system and airbox geometry. The parameters that have high influence on the design of an airbox geometry was determined by using AVL Boost software which simulated the automobile engine. The optimisation of the parameters was done by using Design Expert which adopted the Box-Behnken analysis technique. The result that was obtained from the study are optimised diameter of inlet/snorkel, volume of airbox, diameter of throttle body and length of intake runner are 81.07 mm, 1.04 L, 44.63 mm and 425 mm, respectively. By using these parameters values, the maximum engine performance and minimum fuel consumption are 93.3732 Nm and 21.3695×10-4 kg/s, respectively. This study has fully accomplished its aim to determine the significant parameters that influenced the performance of airbox and optimised the parameters so that a high engine performance and fuel efficiency can be produced. The success of this study can contribute to a better design of an airbox.

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