BatteredBenz, it depends on the load at the time. At idle, the fuel quantity injected is very small and most if not all of it burns completely in the prechamber. It only needs enough fuel to keep the engine freewheeling at 750 rpm. As the piston moves upward, it pushes the air up into the prechamber. This current of air enters through the holes and swirls around inside the prechamber. At full load with max fuel being injected, the burning begins in the prechamber. The burning mixture creates pressure and blasts out through the holes into the combustion chamber. The turbulence created mixes the injected fuel very well with the air charge, and the result is quieter operation and better burn. The prechamber face looks like a rocket engine in that stage. The pintle ball is what creates the swirl as the air enters the prechamber and it's what helps the injected fuel spray break up and mix with the air within the prechamber.

Also, the word you're looking for is "deflagration." The mixture deflagrates within the cylinder. That word means to burn quickly. It doesn't explode per se, but it does burn very rapidly and that's what gives you the diesel knock.