TY JOUR TI ENERGY EFFICIENCY INCREASE OF ROTARY PUMP BY CONVERGENCY INTRODUCTION OF WHEEL INTER-BLADE CANAL KW rotary pump KW energy efficiency KW convergent wheel KW inter-blade canal KW fluid flow KW efficiency JO Bulletin of Bryansk state technical university AU Borovskiy, B.. PY 2016 IS 2016 PB Bryansk State Technical University