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مکانیک::
توربو ماشین
A version of the turbocharged spark ignition engine is capable of providing high thermal efficiency with the least BSAC and minimum turbomachinery weight.
High propulsion efficiency to minimize fuel consumption and low air consumption to minimize turbomachinery weight are two primary considerations when evaluating candidate engine systems.
Based upon a comparison of the combustion airflow characteristics of the above engine cycles, an Otto cycle spark ignition engine offers the lowest specific air consumption which results in the smallest size, and therefore lightest weight turbomachinery.
Even with a Diesel engine which runs on excess air as compared to the spark ignition engine, the turbomachinery size and weight is larger due to the higher air flow at the same horsepower.
The size and corresponding weight of the turbomachinery is directly influenced by the core engine mass airflow requirements.
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