Variable geometry turbocharging is one of the most significant matching methods between turbocharger and engine, and has been proven to provide air boost for entire engine speed range as well as to reduce turbo-lag. An elastically constrained device designed for a novel variable geometry turbocharger was presented in this paper. The design of the device is based on the nozzle vane’s self-adaptation under interactions of the elastic force by elastically restrained guide vane and the aerodynamic force from flowing gas. The vane rotation mechanism of the novel variable geometry turbocharger is different from regular commercial variable geometry turbocharger systems, which is achieved by an active control system (e.g. actuator). To predict the aerodynamic performance of the novel variable geometry turbocharger, the flow field of the turbine was simulated using transient computational fluid dynamics software combined with a fluid–structure interaction method. The results show that the function of elastically constrained device has similar effectiveness as the traditional variable geometry turbocharger. In addition, the efficiency of the novel variable geometry turbocharger is improved at most operating conditions. Furthermore, a turbocharged diesel engine was created using the AVL BOOST software to evaluate the benefits of the new variable geometry turbocharger. The proposed novel variable geometry turbocharger can effectively improve the engine performance at mid-high speeds, such that the maximum decrease of brake-specific fuel consumption reaches 17.91% under 100% load and 3600 r/min engine condition. However, the engine power and brake-specific fuel consumption decrease significantly at low engine speed conditions, and the decrease is more than 26% under 1000 r/min.

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一种通过弹性约束喷嘴导向叶片实现的新型可变几何涡轮机

可变几何涡轮增压是涡轮增压器和发动机之间最重要的匹配方法之一，已被证明可以为整个发动机转速范围提供空气增压并减少涡轮滞后。本文介绍了一种为新型可变几何涡轮增压器设计的弹性约束装置。该装置的设计基于喷嘴叶片在弹性约束导向叶片的弹力和流动气体的气动力相互作用下的自适应。新型可变几何涡轮增压器的叶片旋转机构不同于常规商用可变几何涡轮增压器系统，其通过主动控制系统（例如执行器）实现。为了预测新型可变几何涡轮增压器的空气动力学性能，使用瞬态计算流体动力学软件结合流固耦合方法对涡轮机的流场进行了模拟。结果表明，弹性约束装置的功能与传统的可变几何涡轮增压器具有相似的效果。此外，新型可变几何涡轮增压器的效率在大多数运行条件下都得到了提高。此外，还使用 ​​AVL BOOST 软件创建了涡轮增压柴油发动机，以评估新型可变几何涡轮增压器的优势。所提出的新型可变几何涡轮增压器可以有效提高发动机在中高速下的性能，使得在100%负载和3600 r/min发动机工况下制动比油耗最大降低达到17.91%。然而，