212Essential processes in ic power units

The three essential processes in any internal combustion power unit are compression of the air charge, combustion of the fuel, and expansion of the products as completely as possible to produce mechanical work. The greater the degree of compression and expansion, and the greater the range of temperature effectively utilised, the higher will be the thermal efficiency and the lower the specific fuel consumption. These conditions apply to both piston and turbine engines.

The piston engine can accomplish the first two processes with high efficiency and reliability, but is less successful with the third owing to its unsuitability for handling the large volumes at the low pressure end of the expansion, this being incomplete unless continued in a turbine, which is admirably suited to deal with large volumes at low pressure. Hence, as explained in Chapter 16, the exhaust turbo supercharger forms a mechanically independent but not thermodynamically self-contained high-speed unit which increases the power of the main engine but does not require to be geared to the low-speed power shaft. Moreover, since the gases reach the turbine blades at a manageable temperature, no insoluble temperature-stress-time factor arises with the material of the blading.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

Get My Free Ebook

Post a comment