One difficulty experienced at this time was that the low compression ratio also implied a low expansion ratio during the power stroke.
22.
It is the expansion ratio that fundamentally converts the heat energy of the burning fuel / air mixture into usable mechanical energy.
23.
A key issue with this engine is the water consumption, which can be prohibitive for low expansion ratios and low inlet temperatures.
24.
Its expansion ratio can be designed for low ambient air pressures, without risking flow separation and flight instability during low-altitude flight.
25.
The expansion ratio of this engine was much more effective than that of the 1860 Lenoir engine and gave the engine its superior efficiency.
26.
The changing steam temperature alternately heats and cools the cylinder with every stroke and is a source of inefficiency which increases at higher expansion ratios.
27.
The development engine has " an expansion ratio of just 150, the maximum possible within Earth s atmosphere " to prevent flow separation problems.
28.
Higher Compression ratios also mean that the distance that the piston can push to produce power is greater ( which is called the Expansion ratio ).
29.
The thermal and gas dynamic losses from the prechamber result in direct injection Diesels ( despite their lower compression / expansion ratio ) being more efficient.
30.
Theoretical analysis shows that the resilience depends based on the "'vertex expansion ratio "'of the graph, defined as follows.
