Simulation of Fuel Temperature of Diesel Engine Heating by PTC Materials

2011 ◽  
Vol 480-481 ◽  
pp. 120-125 ◽  
Author(s):  
Xiao Lu Li ◽  
Le Feng Gu ◽  
Cang Su Xu ◽  
Ying Li
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Heating Temperature ◽  
Rapid Heating ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Fuel Temperature ◽  
Lumped Parameter ◽  
Calculation Results

The PTC materials, as a kind of positive temperature coefficient materials, are used to heat diesel fuel in the high-pressure fuel pipe near the injector in Diesel engine, which have a lot of advantages, such as simple structure, safe and rapid heating, and fixed heating temperature around its Curie point. In order to study its heating effect on diesel fuel of the high pressure fuel pipe, the dynamical models for both the controlled object and PTC heater are presented by the way of lumped parameter, and the heating effects are also simulated and analyzed. The calculation results show that the diesel temperature is heated by the PTC materials effectively. Meanwhile, the heating law by PTC materials heating diesel fuel in the high pressure fuel pipe of engine is also summarized.

Dynamic Temperature Test for PTC Material Used to Heat Diesel

2013 ◽  
Vol 321-324 ◽  
pp. 158-162
Author(s):  
Jun Wang ◽  
Xiao Lu Li
Keyword(s):  
Diesel Fuel ◽  
High Performance ◽  
Positive Temperature Coefficient ◽  
Testing System ◽  
Positive Temperature ◽  
Fuel Temperature ◽  
Dynamic Temperature ◽  
Performance And Emissions ◽  
Software And Hardware ◽  
Test Fuel

This paper gives a way which utilizes the PTC (positive temperature coefficient) materials to preheat diesel in the injector in order to improve the cold start performance and emissions of engine. Combining high performance data acquisition system based on MSP430F149, a dynamic temperature testing system was developed to test fuel temperature heated by PTC in injector. The software and hardware electrocircuit were expounded in detail. The temperature varying law of diesel fuel heated with PTC ceramics was measured under different voltage. A conclusion can be draw that diesel fuel may be heated to self-defined temperature around Curie point when diesel fuel was heated with PTC material.

scholarly journals Evaluation of Combustion Performance and Heat Release in Preheated Fuel Consumed Diesel Engines

2021 ◽  
Vol 31 (3) ◽  
pp. 349-363
Author(s):  
Sergey А. Plotnikov ◽  
Anatoly N. Kartashevich ◽  
Marina V. Motovilova
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Heat Release ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Heating Temperature ◽  
Combustion Process ◽  
Thermal Action ◽  
Fuel Combustion ◽  
Combustion Performance

Introduction. The expansion of the fleet of tractors and vehicles causes increased requirements for internal combustion engines. This problem can be solved by improving the work process in a diesel engine that can be achieved by heating the diesel fuel in the fuel supply system. External thermal action is carried out on the high pressure line directly in front of the injectors. Materials and Methods. To analyze and calculate the process of combustion and heat release in a diesel engine with preliminary thermal fuel preparation, bench tests were carried out using the National Instruments software and the necessary equipment. Results. Experimental data of the diesel fuel combustion process in the cylinder of the 4CHN 11.0/12.5 engine are obtained. The analysis of the combustion performance and heat release of diesel with a preliminary high-temperature effect on the fuel was carried out. Indicator diagrams, graphs of heat release, the maximum average temperature of gases in the engine cylinder, and graphs of active and total heat release were constructed. The experimental data showed a decrease in the ignition delay period, the maximum cycle temperature in the engine cylinders, and an acceleration of the start of heat release and combustion process. The values of the parameters of the diesel fuel combustion process are obtained. Discussion and Conclusion. On the basis of the conducted studies, the dependences of the parameters of the combustion process of a diesel engine with fuel heating to high temperatures are revealed. Indicator diagrams allow drawing a conclusion about the influence of the fuel heating temperature on the intensification of the combustion process. There is an acceleration of the beginning of heat release, a decrease in the rate of pressure build-up and in the rigidity of the engine.

The Study about Combustion and Emission Characteristics of n-Butanol/Diesel Fuel Mixture

2014 ◽  
Vol 492 ◽  
pp. 335-340
Author(s):  
Jian Wu ◽  
Li Li Zhu ◽  
Zhan Cheng Wang ◽  
Bin Xu ◽  
Hong Ming Wang
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Release Rate ◽  
Fuel Mixture ◽  
Emission Characteristics ◽  
Maximum Heat ◽  
Maximum Heat Release ◽  
Hc Emissions ◽  
Increasing Load

Experiment of fuel combustion and emission characteristics was carried on a turbocharged intercooled electronically controlled high pressure common rail diesel engine with n-butanol/diesel blends, then the results of experiment were compared and analyzed. The results show that with the adding of n-butanol, the maximum combustion pressure gradually increases and the maximum heat release rate gradually reduces; compared with diesel, CO emissions of the blends are slightly lower and decrease with the increasing load; HC emissions of the mixture fuel are higher and decrease first then increase with the increasing load; at 2000rpm, NOX emissions of the blends are a little lower than the pure diesel in small loads but higher in other loads, and increase with the adding of the load.

scholarly journals The cleaning process model of diesel fuel in an electric field

2019 ◽  
Vol 298 ◽  
pp. 00095 ◽  
Author(s):  
Alexander Abramov ◽  
Alexander Morozov ◽  
Anastasia Koshkina ◽  
Sergey Petryakov ◽  
Julia Nuretdinova
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Diesel Engine ◽  
Electric Field ◽  
Diesel Fuel ◽  
Process Model ◽  
Cleaning Process ◽  
Fuel Pump

The authors of the article carried out the analysis of the failure causes of diesel engine types 4Ч 110/125 and 4ЧН 110/125. As a result of this analysis it was found that the highest percentage of failures occurred in the high-pressure fuel pump and nozzle. The procedure of the electric cleaning process of diesel fuel in an electric field is also considered in the article. A mathematical model of the electric cleaning process of diesel fuel in an electric field has been obtained and the boundaries of the initial parameters of the electric field have been determined.

Effect of Ni Electrode on the Characteristics of BaTiO3 Based PTCR Ceramics

2011 ◽  
Vol 415-417 ◽  
pp. 1000-1004
Author(s):  
Huan Liu ◽  
Rong Zhu ◽  
Zhi Ping Zheng ◽  
Dong Xiang Zhou ◽  
Qiu Yun Fu
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Heating Temperature ◽  
Single Layer ◽  
Volume Ratio ◽  
Cost Effective ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Ni Powder ◽  
Ptcr Effect

In order to achieve cost-effective inner electrodes for the multilayer BaTiO3-based ceramics having a positive temperature coefficient of resistivity (PTCR), we fabricated Ni paste based on Ni powder and investigated the effect of Ni electrode on the performance of semiconducting BaTiO3 ceramics. We adjusted the particle size of Ni powder (0.2μm, 0.6μm and 1μm) and incorporated them as the electrodes into both single-layer and laminated BaTiO3 PTCR devices. The device samples were sintered at 1200oC for 30min in reducing atmosphere consisting of N2 and H2 (97:3 by volume ratio), and went through a post-sintering in-air heat treatment at 700-900oC in air which is necessary for the PTCR effect. The results indicate that Ni powder with lager particle size are more stable against post-sintering heat treatment, and the heating temperature needs to be optimized to overcome the trade-off between ohmic behaviors of Ni electrodes and the PTCR effect of BaTiO3-based semiconducting ceramics.

Doping dependence of semiconductor–metal transition in InP at high pressures

1986 ◽  
Vol 405 (1829) ◽  
pp. 345-353 ◽  
Keyword(s):  
High Pressure ◽  
Liquid Phase ◽  
Hydrostatic Pressure ◽  
Doping Concentration ◽  
High Pressures ◽  
Metallic Phase ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Transition Pressure ◽  
High Concentrations

The resistivity of selenium-doped n-InP single crystal layers grown by liquid-phase epitaxy with electron concentrations varying from 6.7×10 18 to 1.8×10 20 cm -3 has been measured as a function of hydrostatic pressure up to 10 GPa. Semiconductor-metal transitions were observed in each case with a change in resistivity by two to three orders of magnitude. The transition pressure p c decreased monotonically from 7.24 to 5.90 GPa with increasing doping concentration n according to the relation p c = p o [1 - k ( n / n m ) α ], where n m is the concentration (per cubic centimetre) of phosphorus donor sites in InP atoms, p o is the transition pressure at low doping concentrations, k is a constant and α is an exponent found experimentally to be 0.637. The decrease in p c is considered to be due to increasing internal stress developed at high concentrations of ionized donors. The high-pressure metallic phase had a resistivity (2.02–6.47)×10 -7 Ω cm, with a positive temperature coefficient dependent on doping.

scholarly journals Properties of Surface Heating Textile for Functional Warm Clothing Based on a Composite Heating Element with a Positive Temperature Coefficient

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 904
Author(s):  
Han Na Choi ◽  
Seung Hyun Jee ◽  
Jaehwan Ko ◽  
Dong Joo Kim ◽  
Sun Hee Kim
Keyword(s):  
Power Consumption ◽  
Surface Temperature ◽  
Temperature Coefficient ◽  
Heat Generation ◽  
Rapid Heating ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Initial Stage ◽  
Power Application ◽  
Warm Clothing

A high-stretch positive temperature coefficient (PTC) surface heating textile (PTC-SHT) was fabricated using a composite of PTC powder and multiwall carbon nanotubes (MWCNTs). The PTC-SHT (heating area = 100 × 100 mm2) was produced by screen-printing the PTC-MWCNT composite paste onto a high-stretch textile with embroidered electrodes. Overall, the temperature increased to 56.1 °C with a power consumption of 5 W over 7 min. Subsequently, the surface temperature of the PTC-SHT remained constant despite the continued decrease in power consumption. This indicated that heating was accompanied by an increase in resistance of the PTC-SHT, which is typical of this process—i.e., heating to a constant temperature under a constant voltage over an extended period of time. In addition, 4.63 W power was required to heat the PTC-SHT surface from an external temperature of 5 to 45 °C in 10 min, after which stable low-temperature heat generation behavior was observed at a constant temperature of 50 °C, which was maintained over 40 min. In contrast, negative temperature coefficient (NTC) behavior has been observed in an NTC-SHT consisting of only MWCNTs, where a slow heating rate in the initial stage of power application and a continuous increase in surface temperature and power consumption were noted. The PTC-SHT consumed less power for heat generation than the NTC-SHT and exhibited rapid heating behavior in the initial stage of power application. The heat generation characteristics of the PTC-SHT were maintained at 95% after 100,000 cycles of 20% stretch–contraction testing, and the heating temperature remained uniformly distributed within ± 2 °C across the entire heating element. These findings demonstrated that an SHT with PTC characteristics is highly suitable for functional warm clothing applications that require low power consumption, rapid heating, stable warmth, and high durability.

Study of Diesel Fuel Heating by Intelligent Materials under Transient High Pressure

2011 ◽  
Vol 480-481 ◽  
pp. 126-131
Author(s):  
Xiao Lu Li ◽  
Le Feng Gu ◽  
Cang Su Xu ◽  
Jun Wang
Keyword(s):  
High Pressure ◽  
Diesel Fuel ◽  
Pressure Tube ◽  
Heating Effect ◽  
Fuel Temperature ◽  
Unsteady Heat Transfer ◽  
Cold Starting ◽  
Simulation Results ◽  
Heating Model ◽  
The Right

This paper gives a way which utilizes the intelligent heating materials to preheat diesel fuel in the high-pressure tube in order to improve the cold starting and emissions of engine. A heating model of high-pressure tube was brought forward, and the pressure of tube was measured at a Diesel engine as the computational boundary condition. The unsteady heat transfer was simulated using the computational fluid dynamics by the temperature field and heating effect. Simulation results show that the diesel fuel temperature could improve by the right heating size and temperature in the high-pressure tube.

scholarly journals ОЦЕНКА РЕГУЛИРОВОЧНЫХ ПОКАЗАТЕЛЕЙ ДИЗЕЛЯ ПРИ ВЫСОКОТЕМПЕРАТУРНОМ ВОЗДЕЙСТВИИ  НА  ДТ

2019 ◽  
Author(s):  
A.N. Kartashevich ◽  
S.A. Plotnukov ◽  
M.V. Motovilova
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Fuel Injection ◽  
Heating Temperature ◽  
Noticeable Effect ◽  
Exhaust Gases ◽  
Injection Pump ◽  
Installation Angle ◽  
Object Of Study ◽  
Thermal Influence

Цель исследований экспериментальное определение регулировочных показателей дизельного двигателя Д-245.5S2 при его работе на высокотемпературном дизельном топливе. Объект исследования экспериментальная установка: двигатель Д-245.5S2, электротормозной стенд RAPIDO SAK N670 с балансирной маятниковой машиной. Значение установочного угла опережения впрыскивания топлива изменялось в диапазоне от 10 до 30 градусов, через каждые четыре градуса. Испытания проводились на дизельном и подогретом дизельном топливе. Температура подогрева топлива составляла 100 С и 300 С. Предварительное тепловое воздействие на топливо осуществлялось при помощи нагревательного устройства. Подогрев дизельного топлива производился на линии высокого давления между ТНВД и форсункой. Опираясь на полученные в результате испытаний экспериментальные данные, были установлены зависимости регулировочных показателей дизеля при его работе на подогретом топливе. Также выявлены изменения токсичности и дымности отработавших газов при разных значениях установочного угла опережения впрыскивания топлива. Приведены графики регулировочных характеристик по установочному углу опережения впрыскивания топлива без подогрева и с подогревом до 100 С и 300 С (эффективные показатели, показатели токсичности и дымности отработавших газов при частоте вращения коленчатого вала n1800 мин-1). В результате испытаний установлено, что применение подогретого топлива не оказывает заметного влияния на работоспособность форсунки и систему питания дизельного двигателя. Угол опережения впрыскивания топлива впр, при котором эффективные показатели работы двигателя являются оптимальными, составляет 18-22 градуса.The purpose of research experimental determination of the adjustment parameters of the diesel engine D-245.5S2 at its operation on high temperature diesel fuel. Object of study: experimental setup (engine D-245.5S2, electric brake stand RAPIDO SAK N670 with balancing pendulum machine). The value of the angle of advance of fuel injection was varied in the range from 10 to 30 degrees, at intervals of four degrees. Tests were carried out on diesel and heated diesel fuel. Fuel heating temperature 100C and 300C. Preliminary thermal influence on fuel was carried out by means of the heating device. Heating of diesel fuel was carried out on the high pressure line between the injection pump and the nozzle. Based on the experimental data obtained as a result of the tests, the dependence of the adjustment parameters of the diesel during its operation on heated fuel was established. Also, changes in toxicity and smoke, exhaust gases from different values of the installation angle of advance of fuel injection were revealed. The graphs of the adjustment characteristics of the installation angle of advance fuel injection without heating and heated 100C and 300C (effective indicators, indicators of toxicity and smoke in the exhaust gases at a speed of the crankshaft n1800 min-1). As a result of the tests, it was found that the use of heated fuel does not have a noticeable effect on the performance of the injector and the power supply system of the diesel engine. A corner of an advancing of injection of fuel впр at which efficient performance of the engine are the optimum is 18/22.

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