Dragonstar #2: Night of the dragonstar by David Bischoff

A MILES LONG SPACESHIP ON A JOURNEY BETWEEN THE STARS
After establishing communications with the sentient dinosaurs aboard the gigantic alien warship Dragonstar, the human exploration forces were ready to reveal their accomplishments to an eager public.

THEN DISASTER STRUCK.

During a live holovision broadcast, something made the co-operative Saurians go berserk—and begin slaughtering and eating their former friends.

At the same moment the Dragonstar’s access hatches closed down, imprisoning all aboard.

Then, for the first time in centuries, the engines started up…