DYNAMIC-MODEL OF A WIND-DRIVEN LIFT PUMP

This paper examines the dynamics of one of the oldest pieces of equipm ent known to mankind, the simple lift pump. These continue to be used in remote areas of the world for lifting water by hand or using wind p ower. In the case of the smaller modern wind-powered water pumps the s peed of operation is such that dynamic factors need to be taken into a ccount when designing the pump. The paper explores the value of introd ucing softness and elasticity into either the lift rod or the riser su pport. Output from models describing the pump dynamics are compared wi th experimental data.