The turbine blades are installed on turbine wheel that rotates on the surface. The turbine blades design move together with turbine wheel, so turbine blade design can be called as motion blade or path blade. At turbine wheel may be there are some motion blades, each blade row consist of blades which are arranged circle on turbine wheel, each blades has same shape and dimension.
Turbine which has single row motion blade is called as single level turbine and turbine which has some rows motion blades is called as multi-level turbine. At multi-level turbine, fluid work flow through first row blades, second row blades, third row blades and so on. Working fluid in multi-level turbine before flow from one motion blade to other motion blade will flow through the row blades that are united with turbine house.
The blades which are united and do not rotate can be called as fixed or stationary blades. Stationary turbine blade has function to flow working fluid into motion blades and has function also as nozzle. In the multi-level turbine, expansion process of working fluid is performed gradually. So working fluid will flow from one level to next level where each one level consists of one row stationary turbine blade and one row motion turbine blade.
The using of multi-level turbine is designed to increase efficiency. The gap between turbine house and top of turbine blade should be designed as narrow as possible to make fluid energy can be converted maximally into useful work.
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