Study on burning law of slotted tube grain

Burning law of slotted tube grain was presented. The burning area formula were derived and an example of burning law was given. The results show that there exists critical range of design parameters. Out of the critical range, burning law is single progressive or regressive. In the critical range, burning law is first progressive and then regressive. Near the average of critical range, the burning law closes to constant. The burning law of six-slotted tube grain is the closest to constant in the example.