Cross, Split

Properties: adiabatic, not isentropic, directional, inlet based restrictor

This is an element, in which a gas mass flow is split into three separate branches.(See Fig.109) It is characterized by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=CROSS SPLIT card):

• label of the element defined as branch 0.
• label of the element defined as branch 1.
• label of the element defined as branch 2.
• label of the element defined as branch 3.
• cross section $A_0$ of branch 0, whereas $A_1=A_0$
• cross section $A_2$ of branch 2, whereas $A_3=A_2$
• angle $\alpha_1=90^\circ$.
• angle $\alpha_2=90^\circ$.
• hydraulic diameter $d_{h0}=d_{h1}$
• hydraulic diameter $d_{h2}=d_{h3}$
• $\zeta$-correction factor $k_1$ for the main passage ( $\zeta_{eff} = k_1\zeta$)
• $\zeta$-correction factor $k_2$ for the branches ( $\zeta_{eff} = k_2\zeta$)

Figure 109: Geometry of a flow splitting cross