Measure and Study on Heat Balance of Engine

2014 ◽  
Vol 563 ◽  
pp. 149-152
Author(s):  
He Chang ◽  
Xiu Min Yu ◽  
Xian Qu ◽  
Yue Jie Liu
Keyword(s):  
Heat Balance ◽  
Test Bench ◽  
Characteristic Curve ◽  
Temperature Characteristic ◽  
Coolant Temperature ◽  
Main Research ◽  
Rate Characteristic ◽  
Distribution Laws ◽  
Flow Rate Characteristic ◽  
Engine Coolant

—The main research contents in this paper are as following. Building a test bench for engine heat balance, and completed the test equipment and debug engine. Through test we can obtain the coolant pressure characteristic curve, temperature characteristic curve and flow rate characteristic curve in different working conditions. Researched the engine heat distribution laws and influencing factors based on the engine coolant temperature in the engine full-load characteristic conditions.

Servo Valve Nozzle Fuzzy Clustering Analysis Pairing Algorithm

2015 ◽  
Vol 667 ◽  
pp. 476-480
Author(s):  
Xu Dong Pan ◽  
Wen Dong Zhu ◽  
Guang Lin Wang
Keyword(s):  
Flow Rate ◽  
Clustering Analysis ◽  
Characteristic Curve ◽  
Orifice Diameter ◽  
Servo Valve ◽  
Fuzzy Clustering Analysis ◽  
Direct Measurements ◽  
Rate Characteristic ◽  
Hydraulic Servo ◽  
Flow Rate Characteristic

Electro-hydraulic servo valve is the key component of an electro-hydraulic servo control system, and double nozzle flapper valve is the main type of electro-hydraulic servo valve. Nozzles are the important part of a double nozzle flapper valve, the pairing quality is directly related to the performance of the servo valve .Servo valve is of symmetrical structure, and the use of nozzles is also in pairs. The process of nozzles matched in pairs is called pairing process. Because the orifice diameter of the nozzle is only about 0.2 to 0.3 mm, it is difficult to pair with the method of direct measurements. Besides, as a kind of hydraulic components, nozzles are usually paired by flow rate measured under differential pressure. Two nozzles will be matched to a pair if their pressure-flow rate characteristic curve is within the allowed tolerance. To ensure the success rate of pairing, it usually needs a large number of machined nozzles to be sifted. According to the principle of clustering analysis, we propose a new paring algorithm which can match nozzles efficiently and automatically.

scholarly journals Simplification of the procedure for testing common rail fuel injectors

2020 ◽  
Vol 180 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Tomasz STOECK
Keyword(s):  
Test Bench ◽  
Wide Spectrum ◽  
Characteristic Curve ◽  
Technical Condition ◽  
Common Rail ◽  
Microsoft Excel ◽  
Fuel Injectors ◽  
Active Experiment ◽  
Fuel Delivery ◽  
Problematic Situations

The paper presents a simplified methodology for generating the characteristic curve of fuel doses for common rail injectors, which consists in limiting the number of measurements on the test bench and calculating missing data using predefined (array) functions of the Microsoft Excel spreadsheet. This allows checking the method of fuel delivery in a wide spectrum of predefined pressures and atomiser opening times, while reducing the arduousness and time-consumption of the active experiment phase. The proposed solution is particularly useful in problematic situations when standard manufacturer's tests, referred only to selected work points, make it impossible to clearly assess the technical condition of the injector.

Instability of a Premix Burner With Non-Monotonic Pressure Drop Characteristic

2001 ◽  
Author(s):  
Wolfgang Polifke ◽  
Andreas Fischer ◽  
Thomas Sattelmayer
Keyword(s):  
Pressure Drop ◽  
Flame Stabilization ◽  
Operating Conditions ◽  
Negative Slope ◽  
Low Frequencies ◽  
Abrupt Changes ◽  
Rate Characteristic ◽  
Rate Of Heat Release ◽  
Flow Rate Characteristic ◽  
Drop Flow

Thermo-acoustic combustion instabilities have frequently been reported to occur when slight changes in operating conditions lead to significant and abrupt changes in flame shape or flame position, i.e. changes in the mode of flame stabilization. The present paper offers an explanation and mathematical model of this observation. The analysis rests on the assumption that changes in the mode of flame stabilization are accompanied by a significant variation of the pressure drop across burner and flame, such that the pressure drop - flow rate characteristic locally displays a negative slope. In the limit of low frequencies (Helmholtz mode), it is then straightforward to show that an oscillatory instability can result from such behavior. A stability criterion is derived, relating the non-dimensionalized gradient of the pressure drop characteristic to the Helmholtz number of the burner. The physics of the instability mechanism is explained, and it is observed that the Rayleigh criterion need not be satisfied for this kind of instability to occur. The analysis is then extended to higher frequencies and the transfer matrix for a burner with non-monotonic pressure drop is derived in the limit of low Mach number and negligible fluctuations of the rate of heat release. Experimental results obtained with an externally premixed swirl burner are presented. The pressure drop characteristic, the observed onset of instability and the instability frequency match very well the analytical predictions.

scholarly journals Pengaru Suhu dan Umur Panen Terhadap Mutu Tauge (Phaseolus radiates) Selama Penyimpanan Dingin

2016 ◽  
Vol 1 (1) ◽  
pp. 1052-1058
Author(s):  
Cut Hospita Lisa ◽  
Bambang Soekarno Putra ◽  
Ichwana Ichwana
Keyword(s):  
Weight Loss ◽  
Vitamin C ◽  
Research Result ◽  
Soluble Solids ◽  
Coefficient Of Performance ◽  
Coolant Temperature ◽  
Extent Of Damage ◽  
Engine Coolant ◽  
Time Of Harvest ◽  
Bean Sprouts

Abstrak. Tauge kacang hijau yang sering kita konsumsi mengandung banyak gizi yang bermanfaat bagi tubuh kita, tapi termasuk jenis sayuran yang mudah rusak. Untuk meminimalisir tingkat kerusakan dilakukan percobaan menggunakan metode penyimpanan dengan jenis plastik pengemas Strech film dengan 3 variasi umur panen yaitu umur panen 3 hari, umur panen 5 hari dan umur panen 7 hari serta disimpan pada 3 variasi suhu ( 4°C, 7°C dan 30°C). Hasil penelitian diperoleh perlakuan terbaik tauge untuk parameter susut bobot, total padatan terlarut selama penyimpanan 10 hari terdapat pada suhu 7ᴼC variasi umur panen 3 hari dengan persentase susut bobot 15.80%, total padatan terlarut 10.2 % Brix, Vitamin C 1.76 mg, Kalsium 0,21 %, organoleptik warna 3,75, organoleptik aroma 3,55, organoleptik penerimaan keseluruhan 3,55. Hasil perhitungan Menghitung Coefficient Of Performance (COP) menunjukkan bahwa pada suhu 7ᴼC dengan nilai COP 2,45 paling tinggi nilainya dibandingkan suhu 4ᴼC dan energi yang dilepaskan atau beban pendinginan yang harus didinginkan oleh mesin pendingin pada suhu pendinginan 4ᴼC paling besar yaitu 236,6 kJ. Abstract. Mung bean sprouts are often we consume contain many nutrients that are beneficial to our bodies, but including the types of vegetables that are easily damaged. To minimize the extent of damage done experiments using the storage method with a type of plastic packaging Stretch films with 3 variations of harvesting are harvesting three days, harvesting age 5 days and time of harvest 7 days and stored at three variations of temperature (4 ° C, 7 ° C and 30 ° C). The research result was the best treatment parameters bean sprouts for weight loss, total soluble solids during storage of 10 days at a temperature of 7ᴼC variations are harvesting three days with weight loss percentage of 15.80%, amount dissolved solids 10.2% Brix, 1.76 mg Vitamin C, Calcium 0.21 %, 3.75 organoleptic color, aroma organoleptic 3.55, 3.55 organoleptic overall acceptance. The results of calculations Calculating Coefficient Of Performance (COP) show that at temperatures 7ᴼC with the highest value of 2.45 COP value than 4ᴼC temperature and the energy released or cooling load to be cooled by the engine coolant temperature cooling greatest 4ᴼC is 236.6 kJ ,  

scholarly journals Main Engine Coolant Temperature Control System Simulator

1985 ◽  
Vol 20 (3) ◽  
pp. 229-234
Author(s):  
Masanori Itoh ◽  
Shinichi Saitoh ◽  
Tatsuo Arie ◽  
Kenji Horiguchi
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Temperature Control System ◽  
Coolant Temperature ◽  
Main Engine ◽  
Engine Coolant

scholarly journals ALF - a Framework for Evaluating Accelerated Learning in Industry

2019 ◽  
Vol 6 (3) ◽  
pp. 81-99
Author(s):  
Sobah Abbas Petersen ◽  
Manuel Oliveira ◽  
Kristin Hestetun ◽  
Anette Østbø Sørensen
Keyword(s):  
Heat Balance ◽  
Research Question ◽  
Accelerated Learning ◽  
Game Based Learning ◽  
Learning In Games ◽  
Main Research ◽  
Effective Learning ◽  
Industrial Project ◽  
Aluminium Production ◽  
Research Gap

Games have long been considered as a means to support effective learning, motivate learners and accelerate their learning. Several successful studies using game-based learning are reported in the literature. However, there appears to be a research gap on systematically evaluating accelerated learning in game environments. The main research question we address in this paper is how can we evaluate accelerated learning in game-based learning environments? The main contribution of this paper will be a framework for evaluating accelerated learning in games (ALF). We will illustrate the use of this framework by describing studies conducted in the Norwegian industrial project ALTT (Accelerate Learning Through Technology), aimed at capacity building in the aluminium industry, where we have co-designed a game for accelerating learning about the electrolysis process for extracting aluminium and heat balance in the aluminium production cells.

Experiments on the Influence of Cooling Conditions on Thermal Balance and Thermal State for a Heavy-Duty Natural Gas Engine

2015 ◽  
Author(s):  
Shiyang Hua ◽  
Ronghua Huang ◽  
Pei Zhou ◽  
Wei Cheng ◽  
Lishui Jia
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Natural Gas ◽  
Cylinder Head ◽  
Characteristic Curve ◽  
Cooling Water ◽  
Thermal Balance ◽  
Coolant Temperature ◽  
Water Jacket ◽  
Cooling Temperature

Generally, the turbulent-flame velocity of natural gas is significantly lower than diesel in the combustion process, which results in the thermal loads of natural gas engines being significantly higher than those of diesel engines under the same stoichiometric condition without EGR. In this study, a heavy-duty natural gas engine is taken as the research object, which is used to measure the temperatures to analyze the heat transfer characteristics in the cylinder head water jacket around the valve bridges, under different speeds and loads, as well as different coolant temperatures and pressures. Twelve thermocouples are inserted by drilling through the metal in the cylinder head with different heights to measure the metal temperatures at thermally critical areas such as the valve-bridge regions. Therefore, the local heat flux and the extrapolation to coolant wall temperatures are obtained by Fourier’s Law under different engine operating conditions. In addition, the thermal balance tests of the engine are also carried out, and the energy distributions are analyzed in different parts of the engine. The results of the research show that: a) the engine cooling condition has a direct impact on the engine cylinder head temperature. If the cooling temperature is low, the temperatures of the cylinder head’s measuring points have the same increases as the increasing coolant temperature. When the coolant temperature is high, the measuring temperatures have hardly any difference from the increases in cooling temperature. With increasing cooling pressure, the temperature increase at all measuring points, and the temperature of the measuring points varies substantially under high load conditions compared with the low load condition. The results indirectly indicated that local nucleate boiling appeared in the water jacket. b) The heat transfer characteristic curve of the water jacket was obtained from the processing of experimental data. Wall heat flux increases with increasing load, and the relationship between wall heat flux and wall temperature is no longer linear. The heat transfer characteristic curve indicates that the convective heat transfer and boiling heat transfer both appeared in the cooling water jacket. c) With the decrease of engine load, the percentage of crankshaft power in the combustion heat gradually decreases, then the percentage of the heat taken away by the cooling water increases gradually. At the same time, the percentage of the heat taken away by exhaust has changed little. d) The engine cooling temperature has a substantial influence on the engine thermal balance, and the cooling pressure has little effect on the engine thermal balance. With increasing cooling temperature, the heat taken by the cooling water decreased, which lead to an increase in the proportion of crankshaft power. It can be concluded that properly increasing the coolant temperature of the engine can improve the fuel economy of the machine.

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