Predictions of effect of swirl on flow and heat transfer in a rotating cavity

Numerical investigation on the flow and heat transfer characteristics in radial pre-swirl system with different fillet radius at the junction of inlet cavity and nozzle

“…In the pre-swirl rotor-stator system, the performance parameters concerned by the designers are characterized by the preswirl ratio (b p ), the swirl ratio at the receiver hole inlet (b b ), the adiabatic effectiveness (H b,ad ) [9], the discharge coefficient of receiver hole (C d,b ) [7], the total pressure loss in the pre-swirl nozzle (C p,t,n ), the pre-swirl cavity (C p,t ), and the heat transfer coefficient on the rotor wall (h). Eqs.…”

“…Accordingly, the heat transfer characteristics on the bounding surface of the pre-swirl system, especially for rotor disk, were also studied. Karabay et al [9] numerically studied the heat transfer performance on the rotor disk, and they compared the computed values of the adiabaticdisk temperature and the local Nusselt number with theoretical relationships delivered using the Reynolds analogy. The results showed that the numerical values agree well with the theoretical relationships.…”

Numerical investigation of the pre-swirl rotor–stator system of the first stage in gas turbine

“…Eq. (17) was firstly summarized in Karabay's study [15] and employed in a cover-plate preswirl system. It may under-predict the adiabatic wall temperature in the direct-transfer system, in which the cooling air could directly impinge on the rotor disk.…”

“…Karabay et al [15] numerically and theoretically investigated a rotating cavity in which the pre-swirl air flowed radially outward. Computed values showed a good agreement with the theoretical results in terms of the adiabatic disk temperature, pressure distribution and local Nusselt numbers.…”

“…Previous works, such as Karabay et al [15], Owen and Rogers [19] and Pilbrow et al [20], showed that in the pre-swirl systems the flow structure and heat transfer were governed by the values of the pre-swirl ratio (b P ), rotational Reynolds number (Re 4 ) and the turbulent flow parameter (l T ). Under the conditions of 0.5 < b P < 1.5, 0.8 Â 10 6 < Re 4 < 1.2 Â 10 6 and 0.12 < l T < 0.36, Lewis et al [21], Kakade et al [22] and Javiya et al [23] carried out CFD analysis of the pre-swirl rotorestator system, computing the adiabatic effectiveness for the system, the discharge coefficient for the receiver holes and the heat transfer coefficient for the rotor disk surfaces.…”