Yaopeng Li

6 Questions 9 Answers 0 Followers

Questions related from Yaopeng Li

Why the different shapes of chamber top are adopted in direct injection spark ignition engines and direct injection compression ignition engines?

As seen the attached figures, the valve of direct injection compression ignition (DICI) engines, the valves are parallel to the piston top. Howerer, for direct injection spark ignition (DISI)...

02 November 2017 1,365 1 View

The role of flame propagation?

In SI engines, energy is delivered by the flame propagation, so the fuel farther away from spark plug will be ignited. In CI engines, how is the fuel ignited after the first ignition site occurs?...

28 April 2016 3,863 5 View

Has the combination of port injection and directed injection been used in spark gasoline engines?

The combination of port injection and in-cylinder injection has been employed in some diesel engines, and this injection strategy has been proven to improve engine performances. So does anyone...

20 August 2015 7,898 16 View

What are the effects of volumetric efficiency on combustion temperature?

As is known, evelating the intake temperature can reduce volumetric efficiency in diesel engines. Likewise, boosting intake pressure can increase volumetric efficiency. Higher volumetric...

12 July 2015 3,166 11 View

Is the differences between Gibbs Free Energy and lower heating value of a fuel ascribed to the combustion irreversibility?

Is the differences between Gibbs Free Energy and lower heating value of a fuel ascribed to the combustion irreversibility? Thank you for your attention and help.

21 May 2015 7,792 4 View

Is there any relationship between the autoignition temperature and octane number of fuel?

Is there any relationship between the autoignition temperature and octane number of fuel? Is higher autoignition temperature of fuel corresponding to a larger octane number? Thank you for your...

10 May 2015 299 10 View