Noun
a turbine that is driven by jets direct against the blades
Source: WordNetDe Laval's impulse turbine is simpler, less expensive and does not need to be pressure-proof. Source: Internet
Impulse turbines A selection of impulse turbine blades An impulse turbine has fixed nozzles that orient the steam flow into high speed jets. Source: Internet
Whilst this makes the Parsons turbine much longer and heavier, the overall efficiency of a reaction turbine is slightly higher than the equivalent impulse turbine for the same thermal energy conversion. Source: Internet