A Telemetry Linkage System for Piston Temperature Measurements in a Diesel Engine

Assanis, Dennis N.; Friedmann, Francis

doi:10.4271/910299

Cited by 19 publications

(7 citation statements)

References 18 publications

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“…Mechanical grasshopper linkage systems have been employed successfully for a limited number of applications. 22–24 These studies have required complicated designs, but still these systems suffer from a limited life span, 24,25 reduced load capacity for certain applications 24 and limitations on the engine speed due to vibrational concerns in the rotating joints and the linkage bars connected to the connecting rod. With load- and speed-limited combustion strategies, such as HCCI, these constraints are less of an issue.…”

Section: Introductionmentioning

confidence: 99%

“…Hendricks and colleagues 25,31 provide an extensive review of the validity of using a one-dimensional (1D) assumption for calculating surface heat flux since it is well established that coaxial thermocouples (TCs) do indeed have multi-dimensional biases. For this study, and previous studies, the authors relied on legacy work by Assanis and Friedman 24 and Furuhama et al 21 in addition to the aforementioned studies by Hendricks to guide their use of the 1D conduction assumption. Assuming that 1D heat conduction occurs, the surface temperature can be represented by a Fourier series, which combined with a steady periodic boundary conditions allows the surface heat flux calculation using the analytical solution for a semi-infinite solid.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of piston heat transfer under conventional diesel and reactivity-controlled compression ignition combustion regimes

Hendricks

Splitter

Ghandhi

2014

International Journal of Engine Research

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The piston of a heavy-duty single-cylinder research engine was instrumented with 11 fast-response surface thermocouples, and a commercial wireless telemetry system was used to transmit the signals from the moving piston. The raw thermocouple data were processed using an inverse heat conduction method that included Tikhonov regularization to recover transient heat flux. By applying symmetry, the data were compiled to provide time-resolved spatial maps of the piston heat flux and surface temperature. A detailed comparison was made between conventional diesel combustion and reactivity-controlled compression ignition combustion operations at matched conditions of load, speed, boost pressure, and combustion phasing. The integrated piston heat transfer was found to be 24% lower, and the mean surface temperature was 25 °C lower for reactivity-controlled compression ignition operation as compared to conventional diesel combustion, in spite of the higher peak heat release rate. Lower integrated piston heat transfer for reactivity-controlled compression ignition was found over all the operating conditions tested. The results showed that increasing speed decreased the integrated heat transfer for conventional diesel combustion and reactivity-controlled compression ignition. The effect of the start of injection timing was found to strongly influence conventional diesel combustion heat flux, but had a negligible effect on reactivity-controlled compression ignition heat flux, even in the limit of near top dead center high-reactivity fuel injection timings. These results suggest that the role of the high-reactivity fuel injection does not significantly affect the thermal environment even though it is important for controlling the ignition timing and heat release rate shape. The integrated heat transfer and the dynamic surface heat flux were found to be insensitive to changes in boost pressure for both conventional diesel combustion and reactivity-controlled compression ignition. However, for reactivity-controlled compression ignition, the mean surface temperature increased with changes in boost suggesting that equivalence ratio affects steady-state heat transfer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of piston heat transfer under conventional diesel and reactivity-controlled compression ignition combustion regimes

Hendricks

Splitter

Ghandhi

2014

International Journal of Engine Research

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“…The accuracy and flexibility of instantaneous wall temperature and heat flux measurements has been demonstrated in previous work in both conventional SI and CI engines as well as HCCI [6,[26][27][28][29][30][31][32]. The methodology outlined in this paper is based on experimental measurements of instantaneous temperature taken from the piston and head walls.…”

Section: Experimental Measurements Of Surface Temperature Andmentioning

confidence: 99%

Method for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine

Güralp¹,

Najt

Filipi

2013

Journal of Engineering for Gas Turbines and Power

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Homogeneous charge compression ignition (HCCI) combustion is widely regarded as an attractive option for future high efficiency gasoline engines. HCCI combustion permits operation with a highly dilute, well mixed charge, resulting in high thermal efficiency and extremely low NOj, and soot emissions, two qualities essential for future propulsion system solutions. Because HCCI is a thermokinetically dominated process, full understanding of how combustion chamber boundary thermal conditions affect the combustion process are crucial. This includes the dynamics of the effective chamber wall surface temperature, as dictated by the formation of combustion chamber deposits (CCD). It has been demonstrated that, due to the combination of CCD thermal properties and the sensitivity of HCCI to wall temperature, the phasing of autoignition can vary significantly as CCD coverage in the chamber increases. In order to better characterize and quantify the influence of CCDs, a numerical methodology has been developed which permits calculation of the crank-angle resolved local temperature profile at the surface erf a layer of combustion chamber deposits. This unique predictor-corrector methodology relies on experimental measurement of instantaneous temperature underneath the layer, i.e., at the metal-CCD interface, and known deposit layer thickness. A numerical method for validation of these calculations has also been devised. The resultant crank-angle resolved CCD surface temperature and heat flux profiles both on top and under the CCD layer provide valuable insight into the near wall phenomena, and shed light on the interplay between the dynamics of the heat transfer process and HCCI burn rates.There is a substantial body of work on CCD regarding conventional SI and CI engines, but to date, apart from previous results directly related to the work shown in this paper [14,15], there is little previously published work addressing deposits in an HCCI Journal of Engineering for Gas Turbines and Power

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“…The heat transfer has a significant impact on all the key processes, particularly impingement, and near-wall mixing and combustion, but it has to be fully characterized under stratified SI conditions. Even though many investigations have addressed the development of the heat flux measurement methodology [1][2][3][4] and applied it to PFI [5][6][7][8][9][10][11][12][13][14][15] and diesel engines [16][17][18][19], only a few of studies have been published that involve combustion chamber surface temperature measurements in DISI engines [20][21][22]. Steeper et al [20] performed piston surface temperature measurements for a DISI optical engine, while Kato et al [21] measured the average piston surface temperatures using thermistors.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of combustion and heat transfer in a direct-injection spark ignition engine via instantaneous combustion chamber surface temperature measurements

Cho

Assanis

Filipi

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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An experimental study was performed to provide the combustion and in-cylinder heat transfer characteristics resulting from different injection strategies in a direct-injection spark ignition (DISI) engine. Fast-response thermocouples were embedded in the piston top and cylinder head surface to measure the instantaneous combustion chamber surface temperature and heat flux, thus providing critical information about the combustion characteristics and a thorough understanding of the heat transfer process.Two distinctive operating modes, homogeneous and stratified, were considered and their effect on combustion and heat transfer in a DISI engine was investigated. The stratified operating mode yielded significantly higher spatial variations of heat flux than the homogeneous mode. This behaviour is directly caused by the main features of stratified combustion, i.e. vigorous burning of a close-to-stoichiometric mixture near the spark, and a cool, extremely lean mixture at the periphery. The cooling effect of the spray impinging on the piston surface when the fuel is injected late in compression could be detected too. The local phenomena change with varying speed and injection parameters.Comparison between the calculated global heat fluxes and measured local heat fluxes were performed in order to assess the behaviour of classic heat transfer models. Comparisons between the global and local heat fluxes provide additional insight into spatial variations, as well as indications about the suitability of different classic models for investigations of the heat transfer aspect of DISI engines. Special consideration is required when applying classic heat transfer correlations to stratified DISI operation as heat flux values are lower by more than 30 per cent when compared with homogeneous operation of the same engine at the same load.

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A Telemetry Linkage System for Piston Temperature Measurements in a Diesel Engine

Cited by 19 publications

References 18 publications

Experimental investigation of piston heat transfer under conventional diesel and reactivity-controlled compression ignition combustion regimes

Experimental investigation of piston heat transfer under conventional diesel and reactivity-controlled compression ignition combustion regimes

Method for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine

Experimental investigation of combustion and heat transfer in a direct-injection spark ignition engine via instantaneous combustion chamber surface temperature measurements

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