Heat release determination in a constant volume combustion chamber from the instantaneous cylinder pressure

Lapuerta, Magı́n; Sanz-Argent, Josep; Raine, Robert R.

doi:10.1016/j.applthermaleng.2013.11.044

Cited by 30 publications

(11 citation statements)

References 14 publications

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“…A diagnostic model was developed [41] to analyze the results obtained from the dynamic pressure sensor located at the constant volume reactor. This model considers the change in the thermodynamic properties of the gaseous mixture due to combustion and includes a heat transfer submodel.…”

Section: Combustion Diagnosticmentioning

confidence: 99%

Effects of methyl substitution on the auto-ignition of C16 alkanes

Lapuerta

Hernández

Sarathy

2016

Combustion and Flame

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The autoignition quality of diesel fuels, quantified by their Cetane Number or Derived Cetane Number (DCN), is a critical design property to consider when producing and upgrading synthetic paraffinic fuels. It is well known that autoignition characteristics of paraffinic fuels depend on their degree of methyl substitution. However, there remains a need to study the governing chemical functionalities contributing to such ignition characteristics, especially in the case of partially branched ones, which have not been studied in detail. In this work, the autoignition of 2,6,10-trimethyltridecane has been compared with the reference hydrocarbons used for cetane number determination, i.e. n-hexadecane and heptamethylnonane, all of them being C16 isomers. Results from a constant-volume combustion chamber under different pressure and temperature initial conditions showed that the ignition delay time for both cool flame and main combustion events increased less from n-hexadecane to trimethyltridecane than from trimethyltridecane to heptamethylnonane. Additional experimental results from blends of these hydrocarbons, together with kinetic modelling, showed that autoignition times and combustion rates were correlated to the concentration of the functional groups indicative of methyl substitution, although not in a linear manner. When the concentration of these functional groups decreased, the first stage OH radical concentration increased and ignition delay times decreased, whereas when their concentration increased, H 2 O 2 production was slower and ignition was retarded. Contrary to the ignition delay times, DCN was correlated linearly with functional groups, thus homogenizing the range of values and clarifying the differences between fuels.

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Section: Combustion Diagnosticmentioning

confidence: 99%

Effects of methyl substitution on the auto-ignition of C16 alkanes

Lapuerta

Hernández

Sarathy

2016

Combustion and Flame

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“…In order to calculate the AHRR more accurately, a 2500 Hz low-pass (Butterworth) filter was used to smooth the pressure signal, as illustrated in Figure . This type of signal smoothing has been shown to significantly reduce the noise present in the CID’s pressure trace data without altering the data significantly . The term “apparent” in AHRR indicates that the values are approximate, since the exact values could not be quantified solely from the pressure trace data captured in this work.…”

Section: Experimental Sectionmentioning

confidence: 99%

Ignition Behavior of Biodiesel and Diesel under Reduced Oxygen Atmospheres

Mayo

Boehman

2015

Energy Fuels

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The effects of the atmospheric oxygen concentration on the physical and chemical ignition behavior of biodiesel and diesel fuel blends were investigated using an optically accessible constant-volume combustion chamber (600 °C and 20 bar) equipped with a light-duty diesel injector. High-speed imaging was used to measure the transient cone angle and penetration length of the liquid spray jet as it developed within the chamber. Structural fluctuations of the developing spray jets were suggested to be a function of injector pin movement, with their frequency and amplitude being functions of the fuel viscosity and density. Physical and chemical ignition delay was analyzed through detection of excited formaldehyde and hydroxide chemiluminescence using a system of optical filters and photomultiplier tubes. Although biodiesel produced slightly longer physical ignition delays as a result of an extended atomization and evaporation process, its chemical ignition delay was much shorter than that of diesel, which is attributed to the long-chain hydrocarbon fuel structure and fuel oxygen availability. From an engine control and performance standpoint, the short ignition delay and robust heat release profile of biodiesel produced under simulated low-temperature combustion operating conditions demonstrates the compatibility of biodiesel for use in nextgeneration compression ignition engines.

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“…This implies that the decrease in the ID is relatively less as the HST is increased to higher values. This behavior of ID was investigated by Lapuerta et al [30]. As shown in the graphs, it was experimentally observed that ID decreases with the increase of HST for constant CAPs, and also with an increase in CAP at constant HST.…”

Section: Of 12mentioning

confidence: 74%

Effect of Cylinder Air Pressure and Hot Surface Temperature on Ignition Delay of Diesel Spray in a Constant Volume Combustion Chamber

Salman

Kim

2019

Energies

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Present-day direct injection (DI) diesel engines with a high power density of displacement are not just promoting an expansion in the utilization of high-temperature resistant alloys in pistons yet, in addition, the expanded cylinder air pressures. When the temperature of the diesel engines piston exceeds a certain limit, it assumes a critical role at the start of sprays. The target of the present investigation was to look at the effects of cylinder air pressures (CAP) (10–25 bar) and high hot surface temperatures (HST) (350–450 °C). The ignition delay (ID) of pure diesel and that of diesel with Iftex clean system D (a cetane enhancer) are investigated experimentally. The experiments are performed by using a constant volume combustion chamber (CVCC) with a single hole pintle-type nozzle mounted on its head. A strong dependence of ID on the CAPs and HSTs was observed. A CAP of 25 bar is much inferior to the precombustion pressure of DI diesel engines; however, it is the case that combustion typical features are the same in spite of an inferior CAP, HST, and injection pressure. The ID tends to decrease to very small values with an increase in either of the two parameters. At a CAP of 25 bar, the measured ID of diesel with fuel additive is 45.8% lower than the pure diesel. Further, the ID of diesel with fuel additive at a 300 bar injection pressure and 25 bar CAP decreases at a rate of close to 0.2 ms/bar.

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Heat release determination in a constant volume combustion chamber from the instantaneous cylinder pressure

Cited by 30 publications

References 14 publications

Effects of methyl substitution on the auto-ignition of C16 alkanes

Effects of methyl substitution on the auto-ignition of C16 alkanes

Ignition Behavior of Biodiesel and Diesel under Reduced Oxygen Atmospheres

Effect of Cylinder Air Pressure and Hot Surface Temperature on Ignition Delay of Diesel Spray in a Constant Volume Combustion Chamber

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