渦巻噴射弁による噴霧の構造 : 第2報,噴射弁特性と噴霧の構造

抄録

The relationship between swirl atomizers of different flow characteristics and structure of sprays formed by them was clarified experimentally. The injection pressure is varied up to 3.0 MPa and water is used as injection liquid. The mean drop size, spray angle, flow rate of entrained air and the entrained air velocity into the spray decrease with the increase in characteristics factor K(=m· d₀²/(d_e. d_i)). Where m is the inlet hole number of swirl chamber, d₀ is the inlet hole diameter of swirl chamber, d_i is the diameter of swirl chamber and d_e is the orifice diameter. The mean drop size, spray angle and flow rate of entrained air increase with the flow factor B(=2·m^1/2·d₀/d_i). When the d₀ decreases or the d_i increases, the K and B decrease simultaneously. The effects of K and B on drop size, drop velocity and spray angle are canceled. Therefore, the change of spray characteristics is smaller than that incurred by changing K or B individually. The drops of spray concentrate on the sheath relatively and the thickness of the sheath region decreases when the injection pressure increases.