Review of Simple Heat Release Computations

Grimm, Barbara Mitko; Johnson, R. T.

doi:10.4271/900445

Cited by 22 publications

(10 citation statements)

References 7 publications

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“…For all engines, cylinder pressure was measured once per crank-angle degree from a single cylinder using a piezoelectric transducer mounted in the cylinder head. The combustion heat release for each cycle was calculated by integrating the cylinder pressure data using a technique equivalent to the RassweilerWithrow method [7,8]. Typically, time series of between 2800 and 20000 contiguous engine cycles were collected.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Time Irreversibility and Comparison of Cyclic-Variability Models

Green¹,

Daw²,

Armfield³

et al. 1999

SAE Technical Paper Series

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We describe a method for detecting and quantifying time irreversibility in experimental engine data. We apply this method to experimental heat-release measurements from four sparkignited engines under leaning fueling conditions. We demonstrate that the observed behavior is inconsistent with a linear Gaussian random process and is more appropriately described as a noisy nonlinear dynamical process.

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Section: Experimental Apparatusmentioning

confidence: 99%

Time Irreversibility and Comparison of Cyclic-Variability Models

Green¹,

Daw²,

Armfield³

et al. 1999

SAE Technical Paper Series

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“…The combustion products considered are CO, CO 2 and the fact that each molecule of the oxygen in the air is accompanied by 3.773 molecules of nitrogen. All of the six species considered are present in the products, and the amounts of each (the number of moles) are given by the equilibrium constants and for (25) and (26) given in (27) and (28).…”

Section: T T T P Rmentioning

confidence: 99%

“…Different methods of computing the heat release rate were considered, but a method based on the first law of thermodynamics as described in [1] was chosen. This method is referred to as the "single transducer method" in [2]. The HR model can be categorized as a diagnostic Zero-Dimensional model as discussed in [3].…”

Section: Introductionmentioning

confidence: 99%

Combustion Diagnostics by Means of Multizone Heat Release Analysis and NO Calculation

Egnell

1998

SAE Technical Paper Series

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In this paper a combustion diagnostic method is presented where measured pressure data is used to calculate the heat release, local temperatures and concentrations of NO and other species. This is done by a multizone model where the lambda value, i.e. 1/equivalence ratio, in each zone can be chosen arbitrarily. In homogenous charge engines lambda is given by the global air/fuel ratio. The local lambdas during initial combustion in stratified charge and diesel engines have to be estimated either as an average value or with a chosen distribution.One new zone of each local lambda is generated and the temperature, volume and species in all old zones are updated at each time step of calculation. In this paper the model is demonstrated by using pressure data from premixed and direct injected stratified charge natural gas SI engines and from a DI diesel engine.The pre-mixed data is used to validate the model as such while the ambition in the stratified charge and diesel cases has been to find the average local lambda that gives the same NOx emission as measured. The emphasis in the latter cases has been to study the influence on average local lambda of the duration of the fuel injection. Early injected fuel seems to burn at slightly leaner mixtures than later injected.

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“…The energy balance method, or first law (of thermodynamics) method, was initially developed by Krieger and Borman (1966), and has been used extensively since (e.g., Egnell, 2001;Gatowski et al, 1984;Grimm & Johnson, 1990;Heywood & Chun, 1987;Homsy & Atreya, 1997). This method tracks energy flows into and out of the in-cylinder volume and can take into account physical phenomena such as crevice flows and heat transfer.…”

Section: Ig Rohr Formulationmentioning

confidence: 99%

On the Rate of Heat Release for High-Boost, Low-Temperature Combustion Schemes: Accounting for Compressibility Effects

Goldsborough

2009

Combustion Science and Technology

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A methodology has been developed to account for compressibility effects (i.e., non-ideal-gas behavior) in the analysis of heat release rates. These effects may be important for advanced, high-boost, low-temperature combustion schemes currently under investigation, as the high pressure and overall lower temperatures can lead to compressibility factors (Z ¼ Pt/RT) that are significantly greater than 1.0. The rate of heat release (ROHR) formulation developed here uses a generalized energy conservation equation where the cylinder is segregated into three distinct regions (i.e., fresh, burned, and mixed); an arbitrary equation of state can be applied to these zones. Crevice/ringpack flows, which can be substantial under high-boost/high-compression ratio (CR) operation, are taken into account using a source/ sink term. The new methodology is demonstrated using pressure-volume traces for six different engine cycles; these traces have been generated using a real gas engine simulator where the heat release is prescribed by a Wiebe-type function. Results are presented using the Redlich-Kwong-Soave equation of state, with comparisons made between the new formulation and conventional ideal gas ROHR results and computed mean gas temperatures. Noticeable differences in ROHR values are seen for cases where Z becomes greater than 1.05; however, computationally significant differences appear important only for very high or extreme CR operation. A real gas equation of state should be used to estimate the mean charge temperature for all boosted LTC operation as the ideal gas temperature can be off by $ 70-300 K under the cases investigated here.

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Review of Simple Heat Release Computations

Cited by 22 publications

References 7 publications

Time Irreversibility and Comparison of Cyclic-Variability Models

Time Irreversibility and Comparison of Cyclic-Variability Models

Combustion Diagnostics by Means of Multizone Heat Release Analysis and NO Calculation

On the Rate of Heat Release for High-Boost, Low-Temperature Combustion Schemes: Accounting for Compressibility Effects

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