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EFFECT OF ELEVATED PISTON TEMPERATURE ON COMBUSTION CHAMBER DEPOSIT GROWTH

EFFECT OF ELEVATED PISTON TEMPERATURE ON COMBUSTION CHAMBER DEPOSIT GROWTH. OUTLINE. Combustion Chamber Deposits Effect of Combustion chamber deposits Effect of wall temperature on CCD Control & Measurement Of Piston Surface Temperatures Thermocouple Location On The Cap

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EFFECT OF ELEVATED PISTON TEMPERATURE ON COMBUSTION CHAMBER DEPOSIT GROWTH

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  1. EFFECT OF ELEVATED PISTON TEMPERATURE ON COMBUSTION CHAMBER DEPOSIT GROWTH

  2. OUTLINE Combustion Chamber Deposits Effect of Combustion chamber deposits Effect of wall temperature on CCD Control & Measurement Of Piston Surface Temperatures Thermocouple Location On The Cap Monitoring Of Deposit Growth Chemical Analysis

  3. The effect of combustion chamber deposits include octane requirement increase, decreased volumetric efficiency, combustion chamber deposit interference (CCDI) • Combustion chamber deposit interference is the result of physical contact between deposits on the piston top and cylinder head • combustion chamber deposits increases engine-out emissions of pollutants such as unburned hydrocarbons and nitric oxides EFFECT OF CCD

  4. Formation of fuel deposits is due to the condensation of components like aromatics • With increased wall temperature hydrocarbon condensation decreases, deposit formation reduces EFFECT OF WALL TEMPERATURE ON CCD

  5. An experimental study was conducted to investigate the effect of elevated wall temperature on deposit growth • This study monitors CCD growth as a function of metal wall temperature • Attempts are made to determine critical wall temperature for no growth PURPOSE OF THIS STUDY

  6. CONTROL & MEASUREMENT OF PISTON SURFACE TEMPERATURES • A composite piston design was developed • By varying the thickness of the ceramic wafer, the surface temperature of the cap could be increased

  7. CONTROL & MEASUREMENT OF PISTON SURFACE TEMPERATURES

  8. THERMOCOUPLE LOCATION ON THE CAP

  9. A technique for monitoring deposit growth is through the measurement of local surface temperature using thermocouples • As deposit buildup on the surface, forms insulation barrier, reduces heat flow, reduces wall’s surface temperature • Rate of change of wall surface temperature is indicative of rate of deposit growth MONITORING OF DEPOSIT GROWTH

  10. REGIONS WHERE MEASUREMENTS WERE TAKEN

  11. CORRELATION B/N AVERAGE PST & AVERAGE DEPOSIT GROWTH • The average deposit thickness was found to decrease at 3.38µm per mm of ceramic insulation

  12. According to test data, the deposits in the end gas region have highest fuel content. It is due to the deposition of unburned hydrocarbon products • The region b/n sparkplug and intake valve have lower fuel content. This is due to fuel vaporization (16ºC more hotter) • Deposits in the cap’s edge have highest oil content CHEMICAL ANALYSIS

  13. EFFECT OF WALL SURFACE TEMPERATURE ON C/H RATIO • Increase in ST-decrease in concentration of carbon • Increase in ST-decrease in C/H ratio • Deposits on high temperature CC walls were composed of inorganic compounds

  14. Elevating piston temperature critically affected deposit formation in SI engine combustion chamber • No deposit growth was obtained when operating with a WST of 320°C • Test using unleaded fuel with reformer bottoms yielded a 55% increase in deposit growth • Elevating WT, decrease C/H ratio of deposits CONCLUSION

  15. THANK YOU

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