Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

Abstract

Impingement heat transfer is considered one of the most effective cooling technologies that yield high localized convective heat transfer coefficients. This paper studies different configurable parameters involved in jet impingement cooling such as, exit orifice shape, crossflow regulation, target surface modification, spent air reuse, impingement channel modification, jet pulsation, and other techniques to understand which of them are critical and how these heat-transfer-enhancement concepts work. The aim of this paper is to excite the thermal sciences community of this efficient cooling technique and instill some thoughts for future innovations. New orifice shapes are becoming feasible due to innovative 3D printing technologies. However, the orifice shape variations show that it is hard to beat a sharp-edged round orifice in heat transfer coefficient, but it comes with a higher pressure drop across the orifice. Any attempt to streamline the hole shape indicated a drop in the Nusselt number, thus giving the designer some control over thermal budgeting of a component. Reduction in crossflow has been attempted with channel modifications. The use of high-porosity conductive foam in the impingement space has shown marked improvement in heat transfer performance. A list of possible research topics based on this discussion is provided in the conclusion.

Experimental And Numerical Investigation Of A Multi-Jet Impingement Cooling Configuration

“…Furthermore, this will help cooling designers in applying innovative cooling methods by exploiting the arbitrary or preferential movement of the jets, e.g. by using fluidic devices in the impingement configurations as suggested by Dutta & Singh (2021). An intensified jet movement might widen the stagnation zone, which leads to a less pronounced hot spot effect and more uniform heat transfer distribution.…”

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

“…Elektronik cihazların tasarımındaki küçülme eğilimi, bu cihazlar için uygun ısıl koşulları sağlama ihtiyacını beraberinde getirmekte, yüksek işlemci hızı ve yoğunluğuna sahip bu cihazlar için verimli soğutma stratejileri geliştirmek gerekmektedir [4]. Çarpan jetler ile gerçekleşen ısı transferi, yüksek ısı transfer katsayılarının elde edildiği en etkin soğutma tekniklerinden biridir [5]. Çarpan jetler ile gerçekleştirilen soğutma işleminde tek bir jet kullanılabileceği gibi birden fazla jet de aynı anda kullanılabilir.…”

Numerical Investigation and Parameter Sensitivity Analysis on Flow and Heat Transfer Performance of Jet Array Impingement Cooling in a Quasi-Leading-Edge Channel

“…Xu et al [9] numerically studied the flow and heat transfer performance of a 45 • angled swirling jet impinging on a flat wall and fitted the heat transfer correlation for the 45 • angled swirling jet impinging cooling at 6000 ≤ Re ≤ 30,000. Dutta et al [10] reviewed the development trend of jet impingement cooling in gas turbine blades in recent years. They pointed out that the shapes of jet hole outlet, target wall, impingement channel, and the influence of cross-flow are the focus of current jet impingement cooling research.…”