Characterising Wiebe Equation for Heat Release Analysis based on Combustion Burn Factor (Ci)

Abbaszadehmosayebi, G.; Ganippa, Lionel

doi:10.1016/j.fuel.2013.11.006

Cited by 28 publications

(16 citation statements)

References 28 publications

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“…In fact, the superposition of two Wiebe functions, applied in papers [17,18,20,21], almost did not affect the general complexity of the model for heat formation/ heat consumption in the rapid internal combustion engine. However, there is a proposal from [22] to modify the Wiebe function so that it contains only one constanta dimensionless parameter Ci (a factor or a coefficient of combustion). The modified version of the Wiebe equation makes it possible to consider a change in the intensity of combustion (heat formation rate) as being dependent only on a single parameter Ci, thereby facilitating the process to accurately determine the parameters for form m and combustion efficiency a.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In the case of a forced convection, along with a temperature boundary layer, there is a boundary layer of the flow, in which velocity w of gas in the direction of the wall descends from the value w ∞ away from the wall to null directly at the wall. Based on (21) and (22), one can obtain the so-called differential equation of heat transfer…”

Section: Heat Transfer-heat Releasementioning

confidence: 99%

“…Based on information about the value for a heat transfer coefficient, one can estimate a differential heat transfer to the cylinder's walls dQ c (22) whose course is shown in Fig. 11:…”

Section: Certain Types Of External Heat Transfermentioning

confidence: 99%

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Development of praxeological principles to model/study heat generation and heat consumption processes in the engine of rapid internal combustion

Hashchuk

Nikipchuk

2019

EEJET

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Розглядається технологiя моделювання/дослiдження явищ теплотворення, тепловiддачi, тепловикористання у двигунi швидкого внутрiшнього згоряння, в основу якої покладено принципи праксеологiчностi. Визнано, що подальший розвиток класичних пiдходiв до моделювання робочих процесiв у двигунi, спираючись суто чи здебiльшого на аналiтико-алгоритмiчнi описи, є практично неможливим. Тож запропоновано залучити в модель також i реальний робочий простiр двигуна, системно приєднуючи його до вiртуального, втiленого в програмно-алгоритмiчному середовищi, i тим самим впроваджуючи частину реальностi в модель цiєї ж реальностi. В рамках дослiдження за натурний робочий простiр використовувався цилiндр дослiдницького двигуна BRIGGS&STRATTON, змонтованого на спецiальному випробувальному стендi. При цьому з'являється можливiсть суттєво спростити аналiтичну складову модельного вiдображення робочих процесiв в двигунi, вибудовуючи її на основi класичних аналiтичних спiввiдношень, що вiдображають закон збереження речовини, закон збереження енергiї, закон тепловiддачi, рiвняння термодинамiчного стану робочого тiла. Модель набуває конкретностi не за рахунок спецiальних емпiричних описiв, а завдяки черпанню поточної iнформацiї з реального iнформацiйного простору на засадах теорiї подiбностi. Потрiбної ефективностi моделi надає iмiтацiя в програмному середовищi взаємодiї мiж собою i довкiллям двох зон, на якi подiлено модельний робочий простiр двигуна. Двозонна модель протиставлена так званим багатозонним, у рамках яких завжди iснує високий ризик виникнення майже не контрольованих помилок i похибок-моделям, якi потребують складного й трудомiсткого iнформацiйного супроводу й обслуговування. Саме у разi двозонного трактування модельного робочого простору стає можливим вiдмовитись вiд аналiтичного контролю за хiмiчною рiвновагою в робочому середовищi i не iснує причин, якi б зумовлювали речовинний обмiн мiж зонами. А тому тепловiддачу у стiнки робочого простору можна визначати за прикладом однозонної моделi. З проведеного дослiдження випливає доцiльнiсть застосування Вiбе-функцiї для вiртуального симулювання явища теплотворення. Якiсть симулювання суттєво зростає завдяки залученню iнформацiї, отримуваної у процесi, так би мовити, «on-line-спiлкування» вiртуальної (у формi комп'ютерної програми) та реальної (у формi натурного робочого простору) частин модельного середовища. Виклад матерiалу супроводжується iлюстративним матерiалом, який вiдображає таку отриману засобами моделювання iнформацiю про перебiг: робочого тиску в робочому просторi двигуна, температури робочого тiла, коефiцiєнта надмiру повiтря, коефiцiєнта тепловiддачi. Наводяться також приклади змiни iнтенсивностi теплотворення та iнтенсивностi тепловiддачi у поверхнi: робочого простору загалом, гiльзи цилiндра, кришки цилiндра, головки поршня. Серед iлюстрацiй-характеристики внутрiшнього (мiжзонного) теплообмiну Ключовi слова: двигун швидкого внутрiшнього згоряння, теплотворення, теплоспоживання, праксеологiчнi засади моделювання UDC 621.4.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Heat Transfer-heat Releasementioning

confidence: 99%

See 1 more Smart Citation

Development of praxeological principles to model/study heat generation and heat consumption processes in the engine of rapid internal combustion

Hashchuk

Nikipchuk

2019

EEJET

View full text Add to dashboard Cite

show abstract

“…The combustion block includes the wiebe function 7,8,10 which gives the amount of fuel combusted at given crank angle. This block also includes the energy released during combustion.…”

Section: Approach Using Cylinder Modelmentioning

confidence: 99%

Optimisation of Diesel Engine for Hybrid Military Tracked Vehicles using Matlab-Simulink

2017

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The demand in the technology requirements for diesel engines is growing keeping hybrid vehicles in mind. In future the diesel engine no longer drives the wheels directly; as a result the engine can be engaged at a limited number of operating points, thus, offering an opportunity to optimise the fuel efficiency and performance at those operating points. The extent to which this optimisation is possible is limited by practical considerations. Also if the positive and negative power peaks in vehicle during mobility (e.g. acceleration and regenerative braking respectively) can be accommodated by high-power batteries, then the size of the engine can be considerably reduced. The engine's operating points depend on the power-control strategy. The consequences of modifications to these operating points will have an effect on performance and efficiency. As in series hybrid only a limited number of operating points are involved and dynamic performance requirements are not imposed on the diesel engine, significant improvements can be achieved by the optimisation of the diesel engine at these operating points. The feasibility of optimisation of the engine at these operating points can be done by modification on the injection systems, the valve timings and other such parameters. This kind of approach requires the use of complex and repeated experimental analysis of the engine which is costly, cumbersome and time consuming. An alternative to this kind of experimental approach is to develop a simulation model of the engine with the generator in Matlab-Simulink.

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“…From the HRR profile, it is also possible to understand the effect of each tested parameter on the phases of combustion, specifically the flame development phase (usually the phase until 10% of the fuel is burnt), fast burn phase (burnt fuel is from 10% to 90%), and quenching phase. 3 Much research has been conducted on spark ignition engines (SIs), and it is possible to derive the mass fraction burned (MFB) from the AHR profile by knowing the trapped mass in the cylinder and the energetic content of the fuel, thereby providing a value for the fraction of burned fuel along the engine cycle. 4…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of hydrous ethanol combustion in a spark-ignition engine

Rufino

Gallo

Ferreira

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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By evaluating combustion duration and flame development, it is possible to evaluate the effects of utilizing a new type of fuel. This allows for optimization of the operational parameters such as the ignition timing, air–fuel ratio, and throttle opening with respect to efficiency, knock, emissions, and performance. In this work, the combustion of a Brazilian hydrous ethanol fuel was evaluated in a commercial flexfuel engine. Investigations were conducted by performing a heat release analysis of the experimental data and providing combustion characteristics. The experimental design comprised of variations in engine speed, load, ignition timing, and air–fuel ratio under lean condition. The results indicated the relationship between the engine parameters and combustion characteristics under a wide range of operational conditions, and identified the relationship between the physical characteristics of the fuels and their combustion in the commercial engine. For high engine speed, lean combustion presented a similar duration to the stoichiometric combustion duration. When comparing the combustion characteristics obtained for the hydrous ethanol with gasoline combustion, the main differences noted were reduced sensitivity to detonation and a shorter duration of combustion, although the temperature at the start of combustion was lower for ethanol. In addition to shorter combustion duration, ethanol presented a lower value for the Wiebe exponent. The results obtained from the combustion duration values and Wiebe function parameters enable the composition of a set of data required for a simplified combustion simulation.

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Characterising Wiebe Equation for Heat Release Analysis based on Combustion Burn Factor (Ci)

Cited by 28 publications

References 28 publications

Development of praxeological principles to model/study heat generation and heat consumption processes in the engine of rapid internal combustion

Development of praxeological principles to model/study heat generation and heat consumption processes in the engine of rapid internal combustion

Optimisation of Diesel Engine for Hybrid Military Tracked Vehicles using Matlab-Simulink

Diagnosis of hydrous ethanol combustion in a spark-ignition engine

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