LOW DISPENSABLE TURBINE Russian patent published in 2008 - IPC F01D1/04 

FIELD: heat power engineering.

SUBSTANCE: offered is low dispensable turbine including nozzle block and driving wheel with peripheral gaskets and working channels, thus characteristic number is within: (u/C₀)_opt=0.35-0.4 - one-stage performance, (u/Co)_opt=0.22-0.3 - two-stage performance; where u is peripheral velocity at average diameter, C₀ is isentropic velocity of steam flow from nozzle block. Geometrical angle of spill from the first nozzle block providing full steam supply to driving wheel is a_1d=0-9 degrees (for optimal reactivity degree), geometrical angle of stream supply to the first driving wheel is β_1d=5-14 degrees; geometrical angle of spill from first driving wheel is β_2d=Δ_β, where Δβ is ±(0-5) degees; besides, ratio of geometrical characteristics is a_m\a₁=0.95-1.1, a_d\a₁=0.9-1.2, where a_m, a_d, a₁ are diameters of inscribed circles in blade channels of the first driving wheel; and quantity of working blades of the first step is Z₁ = (1.2-3) D_av/B₁, where B₁ is width of driving wheel blades, D_av is average diameter of step; where n is frequency turbine rotor revolution, rpm; besides, cost efficiency of low dispensable turbine application with declared air-gas channel is evaluated by throughput complex A: where is degree of step fractionality.

EFFECT: higher efficiency of turbine at due to reduced number of pressure steps right up to their elimination to reduce weight-dimensional characteristics and cost price of driven low dispensable turbines.

2 dwg