WS-20 Test Flight. www.top81.cn
The WS-20 engine is the one on the inner port (left side) of this Il-76 testbed. The China Flight Test Evaluation (CFTE) has an Il-76 for high altitude testing of engines, such as the WS-10 and WS-20. The WS-20 is wider and bulkier than the D-30 engines powering the IL-76, since it has a higher bypass ratio (meaning a wider fan) for fuel efficiency.
The WS-20 turbofan engine can deliver up to 14 tons of thrust, which makes it comparable to the CFM-56 engine with powers Airbus 320 and Boeing 737s.
Y-20 Comparision. green-stone13.livejournal.com
This speculative CGI compares the current Y-20 prototype with the smaller D-30 engines at the bottom, while the more powerful and efficient WS-20 engined Y-20 is at the top.