First of all, turbocharging is composed of two pipes, the inlet pipe and the exhaust pipe, in which the impeller is connected by the same shaft. Through the air in the exhaust pipe, the impeller rotates and the shaft rotates, so that the impeller in the intake pipe rotates and the intake air is compressed. The more air enters the engine, the more fuel is burned in each ignition cycle. The more fuel, the more power.
The ability of the turbocharger to compress air depends on many aspects, but the most important thing is to have a suitable exhaust volume to start the intake compressor. The "correct" amount depends on the size of the engine, the diameter of the exhaust pipe, and the target pressurization amount you want to establish.
Some people may have heard of sequential turbocharging system. In this system, a small turbocharger first works in the low power part, and then supercharges it before sending power to a larger turbocharger, so that the larger turbocharger can operate at high power more effectively.
Over the years, engineers have found ways to realize the benefits of this system without using multiple turbines. A vague solution is to use a twin-shaft turbocharger. What is this? How does it work? To this end, we consulted the engineer Jason Fenske again.
Double-shaft turbocharger basically combines small and large compressors into one. The exhaust impeller and the intake compressor do not run on a single shaft, but two shafts run concentrically, which means that one shaft is hollow and can rotate independently around the other shaft.
There is a fan-shaped axial impeller at both ends of the inner shaft. Compared with larger radial compressors, these compressors have smaller surface area and mass, so they can stop working faster. On the outer shaft, there are two large disc-shaped radial compressors. However, in the working process, they can only generate supercharging when the engine speed increases and the exhaust pressure increases.
The smaller shaft rotates to the impeller first, which increases the pressure of radial compressors entering the inlet side, making them exchange air faster than when there is only natural airflow. When this low-valley pressurization provides power for the engine and accelerates, the larger radial impeller on the exhaust side will operate, so that the compressor on the intake side will reach the peak pressurization.
Double-shaft turbocharger can be used flexibly in many places, which will greatly improve the working efficiency of modern single-shaft turbocharger. So far, there is no product using the dual-shaft turbocharger technology, but Honeywell has applied for a patent for this technology and may produce this turbocharger under the famous Garrett brand. I believe that in the near future, you will drive a twin-shaft turbocharger home.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.